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.A time zone is a region of the earth that has uniform standard time, usually referred to as the local time.^ The milliseconds in day in standard local time.
  • SimpleTimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • SimpleTimeZone (Java 2 Platform SE 5.0) 6 February 2010 13:45 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ This time zone calculator takes into account daylight saving time (DST), local time zone and accepts dates in past or future.
  • The World Clock – Time Zone Converter 14 January 2010 14:54 UTC www.timeanddate.com [Source type: News]

^ Jump to: navigation , search Standard Time/Time Zones Previous (Standard Time) Next (Subdomain) ...any of the 24 regions of the globe (loosely divided by longitude) throughout which the same standard time is used — answers.com .
  • Standard Time/Time Zones - Site5Wiki 6 February 2010 13:45 UTC wiki.site5.com [Source type: FILTERED WITH BAYES]

.By convention, time zones compute their local time as an offset from UTC (see also Greenwich Mean Time).^ The time zone is stored as an offset from UTC or as a time zone region name.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Time zone offsets are always relative to UTC (Greenwich).
  • Date (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

^ Extracts the UTC from a datetime with time zone offset .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.Local time is UTC plus the current time zone offset for the considered location.^ Knowledge of time zone offsets is required.
  • →    Time Zone Converters — Choose One Time Genie's Time Zone Converters 14 January 2010 14:54 UTC www.timegenie.com [Source type: News]

^ The time zone is stored as an offset from UTC or as a time zone region name.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ International time zones, world time clock, world time zones, GMT / UTC / DST International time zones - World time clock - Current local time .
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

Contents

Introduction

.Time zones are divided into standard and daylight saving (or summer).^ Arizona doesn't have daylight savings time.

^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Daylight-saving time considerations .
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

.Daylight saving time zones (or summer time zones) include an offset (typically +1) for daylight saving time.^ Arizona doesn't have daylight savings time.

^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Abbreviations for standard time and Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.Standard time zones can be defined by geometrically subdividing the Earth's spheroid into 24 lunes (wedge-shaped sections), bordered by meridians each 15° of longitude apart.^ So, what do you do if you aren’t 8 time zones apart and forced into alone time?
  • Getting Real: The alone time zone - Signal vs. Noise (by 37signals) 6 February 2010 13:45 UTC 37signals.com [Source type: Original source]

^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ On the average, a time zone spans 15° of longitude.
  • Units: T 14 January 2010 14:54 UTC www.unc.edu [Source type: Reference]

.The local time in neighboring zones would differ by one hour.^ Each zone is one hour behind the zone to its east.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ US time zone map, US time zones difference .
  • US time zones map: EST PST CST MST, US time zone difference, AST HST AKST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Dual time zones with hours markers 3.
  • New Dual Time Zone Black Leather Band Mens Wrist Watch - eBay (item 290397809373 end time Feb-01-10 18:19:40 PST) 6 February 2010 13:45 UTC cgi.ebay.com [Source type: FILTERED WITH BAYES]

.However, political boundaries, geographical practicalities, and convenience of inhabitants can result in irregularly-shaped zones.^ However, political boundaries, geographical practicalities, and convenience of inhabitants can result in irregularly-shaped zones.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ The boundaries between time zones are often altered to correspond to geographical and political borders.
  • Eyes on the Sky, Feet on the Ground: Chapter Three 6 February 2010 13:45 UTC hea-www.harvard.edu [Source type: FILTERED WITH BAYES]

.Moreover, in a few regions, half-hour or quarter-hour differences are in effect.^ In a few regions, half-hour or quarter-hour differences are in effect.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ The three-hour difference is preserved, but the time zone/region of the original transaction is not.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ The extent of the Netherlands in geographical longitude is about 3.86 degrees, which corresponds to a solar time difference of about 15 and a half minutes: The Sun is highest in the sky about a quarter hour earlier at the eastermost point of the Netherlands than at the westernmost point.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

.Before the adoption of time zones, people used local solar time.^ Parameters: zone - the time zone to use aLocale - the locale for the week data .
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ What is the use of time zones?
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ Calendar getInstance () Gets a calendar using the default time zone and locale.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.Originally this was apparent or true solar time, as shown by a sundial, and later it became mean solar time, as kept by most mechanical clocks.^ The difference between the mean solar time and the true solar time is called the Equation of Time.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ You can read true solar time from a well-adjusted sundial.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ Most of the clocks we use today are either mechanical (with springs, gears, pendula, etc.
  • Eyes on the Sky, Feet on the Ground: Chapter Three 6 February 2010 13:45 UTC hea-www.harvard.edu [Source type: FILTERED WITH BAYES]

.Mean solar time has days of equal length, but the difference between mean and apparent solar time, called the equation of time, averages to zero over a year.^ The difference between the mean solar time and the true solar time is called the Equation of Time.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ This also means that you get different results depending on the time of year.
  • Auto detect a time zone with JavaScript 6 February 2010 13:45 UTC www.onlineaspect.com [Source type: General]

^ The difference between sidereal time and solar time is then 12 hours.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

.The use of local solar time became increasingly awkward as railways and telecommunications improved, because clocks differed between places by an amount corresponding to the difference in their geographical longitude, which was usually not a convenient number.^ The difference between the mean solar time and the true solar time is called the Equation of Time.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ The difference between sidereal time and solar time is then 12 hours.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ The difference between official clock time and the mean solar time of a location depends only on the difference between the geographical longitude of that place and the longitude of the meridian that the official clock time is based on.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

.This problem could be solved by synchronizing the clocks in all localities, but in many places the local time would then differ markedly from the solar time to which people were accustomed.^ Solving a common time zone problem .
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ The local time in neighboring zones would differ by one hour.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]

^ Additionally, Your Clock allows you to compare the time for up to 14 different cities around the world.
  • →    List of Time Zone Abbreviations — What Do Time Zone Abbreviations Means 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

.Time zones are a compromise, relaxing the complex geographic dependence while still allowing local time to approximate the mean solar time.^ The result does not depend on the local time zone.
  • Date (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

^ ISO [ "_" regional_code [ "_" variant] ] The geographical time zone identifier is derived from the offset to UTC. Origin for UTC is the Zero Meridian going through Greenwich.

^ The boundaries between time zones are often altered to correspond to geographical and political borders.
  • Eyes on the Sky, Feet on the Ground: Chapter Three 6 February 2010 13:45 UTC hea-www.harvard.edu [Source type: FILTERED WITH BAYES]

.There has been a general trend to set the boundaries of time zones west of their designated meridians in order to create a permanent daylight saving time effect.^ The real monkey wrench in time zone conversions is daylight-saving time.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ Arizona doesn't have daylight savings time.

^ Transition times for Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.The increase in worldwide communication has further increased the need for interacting parties to communicate mutually comprehensible time references to one another.^ The increase in worldwide communication has further increased the need for interacting parties to communicate mutually comprehensible time references to one another.

^ Interact, share, and communicate with developers worldwide.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ Half a day is plenty of time to communicate with one another.
  • Getting Real: The alone time zone - Signal vs. Noise (by 37signals) 6 February 2010 13:45 UTC 37signals.com [Source type: Original source]

Standard time zones

Standard time zones of the world as of June 2008
.Until fairly recently, time zones were based on Greenwich Mean Time (GMT, also called UT1), the mean solar time at longitude 0° (the Prime Meridian).^ The difference between the mean solar time and the true solar time is called the Equation of Time.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ The prime meridian, corresponding to longitude 0° and passing through Greenwich, England, is the center of time zone zero.
  • Eyes on the Sky, Feet on the Ground: Chapter Three 6 February 2010 13:45 UTC hea-www.harvard.edu [Source type: FILTERED WITH BAYES]

^ All places on the same meridian , which have the same geographical longitude , also have the same true solar time and mean solar time.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

.But as a mean solar time, GMT is defined by the rotation of the Earth, which is not constant in rate.^ But as a mean solar time, GMT is defined by the rotation of the Earth, which is not constant in rate.

^ Unfortunately the Earth does not rotate at exactly a constant rate.
  • World Clock Time Zones Chart 6 February 2010 13:45 UTC aglobalworld.com [Source type: FILTERED WITH BAYES]

^ You may choose a time zone from the provided list or you can just enter an offset from the GMT (Greenwich Mean Time).
  • Time Zone Clock right in your Taskbar Clock - 1st Clock 5. 6 February 2010 13:45 UTC www.1stclock.com [Source type: General]

.So, the rate of atomic clocks was annually changed, or steered, to closely match GMT. In January 1972, however, atomic clock rates were fixed and predefined leap seconds replaced rate changes.^ The Windows time zone is changed to GMT -08:00 Tijuana, Baja California to match the appropriate time zone for Tijuana.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ In UTC, however, about once every year or two there is an extra second, called a "leap second."
  • Date (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

^ Most computer clocks are not accurate enough to be able to reflect the leap-second distinction.
  • Date (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

.This new time system is called Coordinated Universal Time (UTC).^ The dates and times for these files are listed in Coordinated Universal Time (UTC).
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ As new updates become available, all Windows operating systems will receive time zone updates through Windows Update and Microsoft Update.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Time Genie's Coordinated Universal Time (UTC) page is the most complete list for time zones on the Internet.
  • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

.Leap seconds are inserted to keep UTC within 0.9 seconds of UT1. In this way, local times continue to correspond approximately to mean solar time, while the effects of variations in Earth's rotation rate are confined to simple step changes that can be more easily applied to obtain a uniform time scale (International Atomic Time or TAI).^ Leap seconds are introduced as needed into UTC so as to keep UTC within 0.9 seconds of UT1, which is a version of UT with certain corrections applied.
  • Date (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

^ Because the earth's rotation is not uniform (it slows down and speeds up in complicated ways), UT does not always flow uniformly.
  • Date (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

^ GMT = Greenwich Mean Time UTC = Universal Time Coordinated Internet time: @415 beats ( info ) .
  • World Time Zones - Local Time & Date - DST - Flightsim Aviation Zone - Number 1 Flight Simulation & Aviation Resource! - Flight Simulator, Aviation Databases 6 February 2010 13:45 UTC www.flightsimaviation.com [Source type: FILTERED WITH BAYES]

.With the implementation of UTC, nations began to use it in the definition of their time zones instead of GMT. As of 2005, most but not all nations had altered the definition of local time in this way (though many media outlets fail to make a distinction between GMT and UTC).^ Q: When will my Windows time zone definitions be updated if I am using Windows Vista?
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ What is the use of time zones?
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ ISO [ "_" regional_code [ "_" variant] ] The geographical time zone identifier is derived from the offset to UTC. Origin for UTC is the Zero Meridian going through Greenwich.

.Further change to the basis of time zones may occur if proposals to abandon leap seconds succeed.^ Further change to the basis of time zones may occur if proposals to abandon leap seconds succeed.

^ Functionally the watch as the time and a second time zone.
  • Richard Mille RM022 Aerodyne Dual Time Zone Watch - Now With More Orthorhombic Titanium Aluminides! | aBlogtoRead.com 14 January 2010 14:54 UTC ablogtoread.com [Source type: FILTERED WITH BAYES]

^ Change the Time zone of the POA in Groupwise > > 3.
  • Time Zone Change - NOVELL FORUMS 6 February 2010 13:45 UTC forums.novell.com [Source type: General]

.Due to daylight saving time, UTC is the local time at the Royal Observatory, Greenwich only between 01:00 UTC on the last Sunday in October and 01:00 UTC on the last Sunday in March.^ Arizona doesn't have daylight savings time.

^ When Daylight Saving Time ends, the time changes from 02:00:00 a.m.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Abbreviations for standard time and Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.For the rest of the year, local time there is UTC+01, known in the United Kingdom as British Summer Time (BST).^ The United Kingdom has eight time zones for itself and its overseas territories.Canada has six official time zones.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Many countries, or even parts of countries, adopt daylight saving time (also known as Summer Time) during part of the year.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Bremen time zones, Germany time zones, UK time zones, United Kingdom time zones, Brussels time zones, Budapest time zones, Cologne time zones, Copenhagen time zones, Frankfurt time zones, Lisbon time zones, Madrid time zones.
  • Worldwide Time Zone Converter, Greenwich Mean Time GMT, Universal Coordinated Time UTC, World Time Zone Conversions 6 February 2010 13:45 UTC www.export911.com [Source type: News]

Similar circumstances apply in many other places.

Notation of time (ISO 8601)

UTC

.If the time is in UTC, add a 'Z' directly after the time without a space.^ Adds or subtracts (up/down) a single unit of time on the given time field without changing larger fields.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.'Z' is the zone designator for the zero UTC offset.^ ISO [ "_" regional_code [ "_" variant] ] The geographical time zone identifier is derived from the offset to UTC. Origin for UTC is the Zero Meridian going through Greenwich.

^ (However, "+0000" does not have to be in GMT, as other time zones could have the same UTC offset .
  • Time zones, time zone symbols, time zone information 6 February 2010 13:45 UTC www.artistrelations.com [Source type: News]

^ (However, "-0800" does not have to be in AKDT, as other time zones could have the same UTC offset).
  • Time zones, time zone symbols, time zone information 6 February 2010 13:45 UTC www.artistrelations.com [Source type: News]

"09:30 UTC" is therefore represented as "09:30Z" or "0930Z". "14:45:15 UTC" would be "14:45:15Z" or "144515Z".
UTC time is also known as 'Zulu' time, since 'Zulu' is the NATO phonetic alphabet word for 'Z'.

Time zone as offsets from UTC

.Time zone are written as offset from UTC in the format ±[hh]:[mm], ±[hh][mm], or ±[hh].^ ISO [ "_" regional_code [ "_" variant] ] The geographical time zone identifier is derived from the offset to UTC. Origin for UTC is the Zero Meridian going through Greenwich.

^ Offset from Coordinated Universal Time (UTC) .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ An expression: If an expression returns a character string with a valid time zone format, then Oracle returns the input in that time zone.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.So if the time being described is one hour ahead of UTC (such as the time in Berlin during the winter), the zone designator would be "+01:00", "+0100", or simply "+01". This is appended to the time in the same way that 'Z' was above.^ The local time in neighboring zones would differ by one hour.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Why would Nepal choose such a crazy time zone?
  • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

^ Similarly, the time zone centered about 15°E is one hour ahead (+1) Greenwich.
  • Eyes on the Sky, Feet on the Ground: Chapter Three 6 February 2010 13:45 UTC hea-www.harvard.edu [Source type: FILTERED WITH BAYES]

.The offset from UTC changes with daylight saving time, e.g.^ Arizona doesn't have daylight savings time.

^ When Daylight Saving Time ends, the time changes from 02:00:00 a.m.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Abbreviations for standard time and Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

a time offset in .Chicago, would be "−06:00" for the winter (Central Standard Time) and "−05:00" for the summer (Central Daylight Time).^ (GMT+9:00) Yakutsk Time (Moscow+06 - Lena River) .
  • Polycom VMC1000: Select Your Time Zone 14 January 2010 14:54 UTC vmc.ext.msstate.edu [Source type: News]

^ (GMT-5:00) Eastern Standard Time (Indiana - Crawford County) .
  • Polycom VMC1000: Select Your Time Zone 14 January 2010 14:54 UTC vmc.ext.msstate.edu [Source type: News]

^ (GMT-9:00) Alaska Standard Time .
  • Polycom VMC1000: Select Your Time Zone 14 January 2010 14:54 UTC vmc.ext.msstate.edu [Source type: News]

Abbreviations

.Time zones are often represented by abbreviations such as "EST, WST, CST" but these are are not part of the international time and date standard ISO 8601 and their uses as sole designator for a time zone is not recommended.^ By the looks of it EclipseLink stores the date using the current time-zone.
  • Nabble - EclipseLink - Users - MySQL's datetime and time-zones? 6 February 2010 13:45 UTC old.nabble.com [Source type: FILTERED WITH BAYES]

^ What is the use of time zones?
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ Abbreviations for standard time and Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.Such designation can be ambiguous as some abbreviations may refer to different timezone in other continents for example EST WST CST can refer to Eastern, Western or Central, Summer Time or Standard Time in both North America and Australia.^ Time difference between CST and EST is 1 hr EST is 1 hr ahead of CST, when it is 1 pm in CST, it is 2 pm in EST .
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]

^ I'm not sure of any JDBC drivers that support the new PreparedStatement.setDate/Time/Timestamp methods that take the Calendar for the timezone, but agree that we should support these, although we may need some platform option to enable the support.
  • Nabble - EclipseLink - Users - MySQL's datetime and time-zones? 6 February 2010 13:45 UTC old.nabble.com [Source type: FILTERED WITH BAYES]

^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]

Examples

.These examples give the local time at various locations around the world at 12:00 UTC when daylight saving time (or summer time, etc.^ Last Saturday in September, at 2:00 local daylight saving time .

^ First of April, at 0:00 local daylight saving time .

^ UTC+5:30, no daylight saving time) .

) is not in effect:
Location(s) Time zone Time
Baker Island, Howland Island (both uninhabited) UTC−12 00:00
Apia, Pago Pago UTC−11 01:00
Honolulu, Papeete UTC−10 02:00
Anchorage, Juneau UTC−09 03:00
Los Angeles, San Diego, San Francisco, Las Vegas, Vancouver, Tijuana, Seattle UTC−08 04:00
Boise, Calgary, Denver, El Paso, Hermosillo, Phoenix, Salt Lake City UTC−07 05:00
Chicago, Minneapolis, Mexico City, Houston, Nashville, Omaha, Winnipeg, San Salvador, San José, Guatemala City, Tegucigalpa, Panama City UTC−06 06:00
Toronto, Ottawa, Boston, New York City, Montreal, Washington D.C., Atlanta, Havana, Nassau, Kingston, Bogotá, Detroit, Lima, Quito UTC−05 07:00
Caracas UTC−04:30 07:30
Asunción, Bridgetown, Halifax, Roseau, Saint George, Santo Domingo, San Juan, Santiago, Port of Spain UTC−04 08:00
St. John's, Newfoundland and Labrador UTC−03:30 08:30
Buenos Aires, Montevideo, Rio de Janeiro, São Paulo UTC−03 09:00
Fernando de Noronha, South Georgia and the South Sandwich Islands UTC−02 10:00
Azores, Cape Verde UTC−01 11:00
Accra, Dakar, Monrovia, Dublin, Casablanca, London, Lisbon, Reykjavík, Canary Islands UTC 12:00
Berlin, Paris, Rome, Bern, San Marino, Praha, Brussels, Amsterdam, Wien, Belgrade, Stockholm, Oslo, Copenhagen, Luxembourg, Monaco, Madrid, Tunis UTC+01 13:00
Amman, Beirut, Istanbul, Athens, Cairo, Cape Town, Helsinki, Jerusalem, Bucharest, Sofia, Kiev, Tallinn, Riga, Vilnius UTC+02 14:00
Addis Ababa, Antananarivo, Baghdad, Dar es Salaam, Doha, Kampala, Kuwait City, Manama, Moscow, Mogadishu, Nairobi, Riyadh, Saint Petersburg, Sana'a UTC+03 15:00
Tehran UTC+03:30 15:30
Baku, Dubai, Muscat, Mauritius, Seychelles , Samara, Tbilisi UTC+04 16:00
Kabul UTC+04:30 16:30
Karachi, Maldives, Tashkent, Yekaterinburg UTC+05 17:00
Colombo, Chennai, New Delhi, Mumbai, Kolkata UTC+05:30 17:30
Kathmandu UTC+05:45 17:45
Almaty, Dhaka, Omsk UTC+06 18:00
Cocos Islands, Yangon UTC+06:30 18:30
Bangkok, Jakarta, Hanoi, Krasnoyarsk UTC+07 19:00
Beijing, Hong Kong, Irkutsk, Kuala Lumpur, Manila, Perth, Taipei, Singapore, Ulan Bator UTC+08 20:00
Pyongyang, Seoul, Tokyo, Osaka, Yakutsk UTC+09 21:00
Adelaide, Darwin UTC+09:30 21:30
Melbourne, Sydney, Vladivostok UTC+10 22:00
Magadan, Nouméa UTC+11 23:00
Auckland, Petropavlovsk-Kamchatsky, Suva UTC+12 00:00 (the following day)
Chatham Islands UTC+12:45 00:45 (the following day)
Nukuʻalofa UTC+13 01:00 (the following day)
Kiritimati UTC+14 02:00 (the following day)
.Where the adjustment for time zones results in a time at the other side of midnight from UTC, then the date at the location is one day later or earlier.^ If ‘Zone Stepped’ scrolling is selected then each time zone is displayed one after the other.

^ Offset (long date) Returns the offset of this time zone from UTC at the specified date.
  • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ Offset (long date) Returns the offset of this time zone from UTC at the specified date.
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

Some examples when UTC is 23:00 on Monday when daylight saving time is not in effect:
Some examples when UTC is 02:00 on Tuesday when daylight saving time is not in effect:
  • Honolulu, Hawaii, United States: UTC−10; 16:00 on Monday
  • Toronto, Ontario, Canada: UTC−05; 21:00 on Monday
.The time-zone adjustment for a specific location may vary because of daylight saving time.^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ The time zone environment variables are: .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Abbreviations for standard time and Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.For example New Zealand, which is usually UTC+12, observes a one-hour daylight saving time adjustment during the Southern Hemisphere summer, resulting in a local time of UTC+13.^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ The local time in neighboring zones would differ by one hour.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Daylight saving time zones (or summer time zones) include an offset (typically +1) for daylight saving time.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

Time zone conversions

Conversion between time zones obeys the relationship
"time in zone A" − "UTC offset for zone A" = "time in zone B" − "UTC offset for zone B",
in which each side of the equation is equivalent to .UTC. (The more familiar term "UTC offset" is used here rather than the term "zone designator" used by the standard.^ TIMESTAMP '1999-01-15 8:00:00 -8:00' TIMESTAMP '1999-01-15 11:00:00 -5:00' You can replace the UTC offset with the TZR (time zone region) format element.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ The time zone is stored as an offset from UTC or as a time zone region name.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ The time zone may be set to an absolute offset from UTC or to a named region.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

)
The conversion equation can be rearranged to
"time in zone B" = "time in zone A" − "UTC offset for zone A" + "UTC offset for zone B".
.For example, what time is it in Los Angeles (UTC offset= −08) when the New York Stock Exchange opens at 09:30 (−05)?^ TIMESTAMP '1999-01-15 8:00:00 -8:00' TIMESTAMP '1999-01-15 11:00:00 -5:00' You can replace the UTC offset with the TZR (time zone region) format element.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ The time zone is stored as an offset from UTC or as a time zone region name.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ The time zone may be set to an absolute offset from UTC or to a named region.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

time in Los Angeles = 09:30 − (−05:00) + (−08:00) = 06:30
In Delhi (UTC offset= +5:30), the New York Stock Exchange opens at
time in Delhi = 09:30 − (−05:00) + (+5:30) = 20:00
.These calculations become more complicated near a daylight saving boundary (because the UTC offset for zone X is a function of the UTC time).^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ The periods when Daylight Saving Time begins or ends are boundary cases.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ The time zone is stored as an offset from UTC or as a time zone region name.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

History

.Greenwich Mean Time (GMT) was established in 1675 when the Royal Observatory was built, as an aid to (English) mariners to determine longitude at sea.^ GMT  GREENWICH MEAN TIME  also  (UT) UNIVERSAL TIME - Common standard for astrological calculations related to Greenwich/GB. GMT should not be used as a time zone (-see WET).
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ The time zone offset is the difference (in hours and minutes) between local time and UTC (Coordinated Universal Time, formerly Greenwich Mean Time).
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ GREENWICH MEAN TIME  UNIVERSAL TIME .
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

.At the time, each town's local clock in the area was calibrated to its local noon.^ International time zones, world time clock, world time zones, GMT / UTC / DST International time zones - World time clock - Current local time .
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

.Therefore, each clock across England had a slightly different time.^ Additionally, Your Clock allows you to compare the time for up to 14 different cities around the world.
  • →    List of Time Zone Abbreviations — What Do Time Zone Abbreviations Means 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

^ Therefore, this system clock behavior, which you called "the #1 annoyance [for non-admin users]" is a HUGE issue for users who just want to view the date/time too!
  • Aaron Margosis' "Non-Admin" and App-Compat WebLog : Changing the system date, time and/or time zone 6 February 2010 13:45 UTC blogs.msdn.com [Source type: FILTERED WITH BAYES]

.The first time zone in the world was established by British railway companies on December 1, 1847—with GMT kept by portable chronometers.^ International time zones - world clock .
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ The most important time zone to know is GMT and thus the reason why it is placed at the top of the list.
  • →    List of Time Zone Abbreviations — What Do Time Zone Abbreviations Means 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

^ The Outlook Time Zone Data Update tool is run on the organizer’s mailbox first.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

This quickly became known as Railway Time. .About August 23, 1852, time signals were first transmitted by telegraph from the Royal Observatory, Greenwich.^ Tuesday, August 08, 2006 2:35 PM by GL All this talk about "changing" the system date and time.
  • Aaron Margosis' "Non-Admin" and App-Compat WebLog : Changing the system date, time and/or time zone 6 February 2010 13:45 UTC blogs.msdn.com [Source type: FILTERED WITH BAYES]

.Even though 98% of Great Britain's public clocks were using GMT by 1855, it was not made Britain's legal time until August 2, 1880. Some old clocks from this period have two minute hands—one for the local time, one for GMT.[1] This only applied to the island of Great Britain, not to the island of Ireland.^ If one or more of the public folders in the path contains a backslash as part of its name, you must use a double backslash.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ However, the system time on the computer is off by one hour during the extended DST period.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Parameters: zone - the time zone to use aLocale - the locale for the week data .
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.On November 2, 1868, the then-British colony of New Zealand officially adopted a standard time to be observed throughout the colony, and was perhaps the first country to do so.^ Many countries, or even parts of countries, adopt daylight saving time (also known as Summer Time) during part of the year.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Added bullet to "Known Issues and limitations" section about New Zealand Standard Time.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ New Zealand Summer Time  Neuseelaendische Sommerzeit .
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

.It was based on the longitude 172°30′ East of Greenwich, that is 11 hours 30 minutes ahead of GMT. This standard was known as New Zealand Mean Time.^ A: The Time Zone Data Update Tool can detect that there are new rules for a given time zone based on a new concept of "dynamic time zone rules."
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Added bullet to "Known Issues and limitations" section about New Zealand Standard Time.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ For example, if you create an appointment by using previous time zone rules and then view the appointment under new time zone rules, the appointment time is shifted by one hour.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

Timekeeping on the American railroads in the mid 19th century was somewhat confused. .Each railroad used its own standard time, usually based on the local time of its headquarters or most important terminus, and the railroad's train schedules were published using its own time.^ Each railroad used its own standard time, usually based on the local time of its headquarters or most important terminus, and the railroad's train schedules were published using its own time.

^ The milliseconds in day in standard local time.
  • SimpleTimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • SimpleTimeZone (Java 2 Platform SE 5.0) 6 February 2010 13:45 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ The most accurate time base.
  • What Are Time Zones? 6 February 2010 13:45 UTC www.stargatefan.com [Source type: FILTERED WITH BAYES]

.Some major railroad junctions served by several different railroads had a separate clock for each railroad, each showing a different time; the main station in Pittsburgh, Pennsylvania, for example, kept six different times.^ Additionally, Your Clock allows you to compare the time for up to 14 different cities around the world.
  • →    List of Time Zone Abbreviations — What Do Time Zone Abbreviations Means 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

^ For example, this can occur when the user has single-instance appointments that are targeted at a different time zone.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ However, some key differences exist between a time zone move operation and a time zone update operation.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

One can imagine the confusion for travelers making a long journey that involved several changes of train.
Plaque commemorating the Railway General Time Convention of 1883
.Charles F. Dowd proposed a system of one-hour standard time zones for American railroads about 1863, although he published nothing on the matter at that time and did not consult railroad officials until 1869. In 1870, he proposed four ideal time zones (having north–south borders), the first centered on Washington, D.C., but by 1872 the first was centered 75°W of Greenwich, with geographic borders (for example, sections of the Appalachian Mountains).^ The local time in neighboring zones would differ by one hour.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ The United Kingdom has eight time zones for itself and its overseas territories.Canada has six official time zones.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Standard time zones (Winter Time zones) can be defined by geometrically subdividing the Earth's spheroid into 24 lunes (wedge-shaped sections), bordered by meridians each 15 of longitude apart.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

.Dowd's system was never accepted by American railroads.^ Dowd's system was never accepted by American railroads.

^ Charles F. Dowd proposed a system of one-hour standard time zones for American railroads about 1863, although he published nothing on the matter at that time and did not consult railroad officials until 1869.

^ Multiple time zones were first proposed by Charles F. Dowd about 1863 for American railroads as a teacher to his students.
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

Instead, U.S. and Canadian railroads implemented a version proposed by William F. Allen, the editor of the Traveler's Official Railway Guide.[2] .The borders of its time zones ran through railroad stations, often in major cities.^ The borders of its time zones ran through railroad stations, often in major cities.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ ISO [ "_" regional_code [ "_" variant] ] The geographical time zone identifier is derived from the offset to UTC. Origin for UTC is the Zero Meridian going through Greenwich.

^ Instead, U.S. and Canadian railroads implemented their own version on Sunday, November 18, 1883, also called "The Day of Two Noons", when each railroad station clock was reset as standard-time noon was reached within each time zone.

.For example, the border between its Eastern and Central time zones ran through Detroit, Buffalo, Pittsburgh, Atlanta, and Charleston.^ The following example converts the datetime value in the America/New_York time zone to the datetime value in the America/Los_Angeles time zone.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ For example, if you compare data of TIMESTAMP WITH TIME ZONE datatype with data of TIMESTAMP datatype, Oracle converts the TIMESTAMP data to TIMESTAMP WITH TIME ZONE , using the session time zone.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ As new updates become available, all Windows operating systems will receive time zone updates through Windows Update and Microsoft Update.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.It was inaugurated on Sunday, November 18, 1883, also called "The Day of Two Noons", when each railroad station clock was reset as standard-time noon was reached within each time zone.^ International time zones - world clock .
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Do time zone conversions between two cities.
  • The World Clock – Time Zone Converter 14 January 2010 14:54 UTC www.timeanddate.com [Source type: News]

.The zones were named Intercolonial, Eastern, Central, Mountain, and Pacific.^ From east to west they are Eastern Standard Time (EST), Central Standard Time (CST), Mountain Standard Time (MST), Pacific Standard Time (PST), Alaskan Standard Time (AST), and Hawaii-Aleutian Standard Time (HST).
  • America Time Zones 6 February 2010 13:45 UTC www.classbrain.com [Source type: FILTERED WITH BAYES]

^ For example, the border between its Eastern and Central time zones ran through Detroit , Buffalo , Pittsburgh , Atlanta , and Charleston .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Pacific Time Vs Eastern Time Zone .
  • Time Zone Downloads - Time Zone Helper (DataMystic), Time Zone Calculator (Evercyber), ... 6 February 2010 13:45 UTC www.fileheap.com [Source type: General]

.Within one year, 85% of all cities with populations over 10,000, about 200 cities, were using standard time.^ How about Mountain Standard Time?
  • Which Time Zone? - Discussion » ChinesePod 6 February 2010 13:45 UTC chinesepod.com [Source type: General]

^ Within one year, 85% of all cities having populations over 10,000, about 200 cities, were using standard time.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

^ Within one year, 85% of all cities with populations over 10,000, about 200 cities, were using standard time.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

[3] .A notable exception was Detroit (which is about half-way between the meridians of eastern time and central time), which kept local time until 1900, then tried Central Standard Time, local mean time, and Eastern Standard Time before a May 1915 ordinance settled on EST and was ratified by popular vote in August 1916. The confusion of times came to an end when Standard zone time was formally adopted by the U.S. Congress on March 19, 1918, in the Standard Time Act.^ Standard time zones (Winter Time zones) can be defined by geometrically subdividing the Earth's spheroid into 24 lunes (wedge-shaped sections), bordered by meridians each 15 of longitude apart.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Local Sun Time for historical data before the introduction of proper uniformed time keeping, - roughly coinciding with the development of railway (before the 19th century).
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ The Calendar returned is based on the current time in the given time zone with the given locale.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

U.S. Commissioner of Railroads William H. Armstrong gave the following account of the new railroad time system in his Report to the Secretary of the Interior for 1883.
"The question of uniform time standards for railways of the United States has long attracted the attention of railway managers, but Mr. W. F. Allen, editor of the Traveler's Official Guide, and secretary of the time conventions, is entitled to the credit of having perfected the admirable system which was adopted by the General Time Convention of Railway Managers, held at Chicago, October 11, 1883, and ratified by the Southern Railway Time Convention, held at New York, October 17, 1883. As this is a subject of great interest to the entire country, a brief synopsis of the general principles governing the proposed plan is deemed appropriate in this report.
."Under the present system each railway is operated independently on the local time of some principal point or points on said road, but this plan was found to be highly objectionable, owing to the fact that some fifty standards, intersecting and interlacing each other, were in use throughout the country.^ Operating system local time zone ( ' OS_TZ' ) .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Local Sun Time for historical data before the introduction of proper uniformed time keeping, - roughly coinciding with the development of railway (before the 19th century).
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ Using the /Quiet option in a time zone move operation .
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.By the plan which has been adopted this number will be reduced to four, the difference in time being one hour between each, viz, the 75th, 90th, 105th, and 120th degrees of longitude west from Greenwich.^ The local time in neighboring zones would differ by one hour.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Adjusts item during extended DST period by one hour Stamps the time zone property on the items .
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.The adoption of these standards will not cause a difference of more than thirty minutes from the local time at any point which is now used as a standard.^ You can include these items by using the Details option in the Time Zone Data Update Tool to prevent them from being updated.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Parameters: zone - the time zone to use aLocale - the locale for the week data .
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

."The new arrangement goes into effect November 18, 1883, and all changes of time are to occur at the termini of roads, or at the ends of divisions.^ Daylight Saving Time goes into effect.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ So for example, the USA research stations tend to have the same time as New Zealand since the USA scientists all leave for Antarctica from Christchurch , New Zealand.
  • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

^ Returns the date and time of the operating system on which the database resides, taking into account the time zone of the database server's operating system that was in effect when the database was started .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.The seventy-fifth meridian being almost precisely the central meridian for the system of roads now using standards based upon the time of the Eastern cities, and the ninetieth meridian being equally central for roads now running by the time of Western cities, the time of these meridians has been adopted for the territory which includes 90 per cent.^ You can use the following administrative template to create a Group Policy object to prevent the Change Calendar Time Zone Tool in Outlook 2007 from running.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ After the Time Zone Data Update Tool is installed, a user who has standard user permissions can run the tool against the user's mailbox.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Note In the time zone update mode, these options may be used together with either the /ONLYCREATEDPREPATCH: or the /IGNOREPATCHDATE command-line options.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

of the whole railway system of the country. .Nearly all of the larger cities have abolished local time and adopted that of the nearest standard meridian in use by the railways."^ Local Sun Time for historical data before the introduction of proper uniformed time keeping, - roughly coinciding with the development of railway (before the 19th century).
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ GMT  GREENWICH MEAN TIME  also  (UT) UNIVERSAL TIME - Common standard for astrological calculations related to Greenwich/GB. GMT should not be used as a time zone (-see WET).
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ Parameters: zone - the time zone to use aLocale - the locale for the week data .
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

[4][5]
.While the first person to propose a worldwide system of time zones was the Italian mathematician Quirico Filopanti, in his book Miranda! published in 1858, his idea was unknown outside the pages of his book until long after his death, so it did not influence the adoption of time zones during the 19th century.^ Local Sun Time for historical data before the introduction of proper uniformed time keeping, - roughly coinciding with the development of railway (before the 19th century).
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ Time zone information for Outlook is obtained from the Windows operating system in which the calendar items are created and is obtained at the time that the calendar items are created.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ The Outlook Time Zone Data Update tool is run on the organizer’s mailbox first.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.He proposed 24 hourly time zones, which he called "longitudinal days", the first centered on the meridian of Rome.^ Standard time zones (Winter Time zones) can be defined by geometrically subdividing the Earth's spheroid into 24 lunes (wedge-shaped sections), bordered by meridians each 15 of longitude apart.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ The Outlook Time Zone Data Update tool is run on the organizer’s mailbox first.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Converts a datetime or interval value of DATE , TIMESTAMP , TIMESTAMP WITH TIME ZONE , TIMESTAMP WITH LOCAL TIME ZONE , INTERVAL MONTH TO YEAR , or INTERVAL DAY TO SECOND datatype from the database character set to the national character set .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.He also proposed a universal time to be used in astronomy and telegraphy.^ GMT  GREENWICH MEAN TIME  also  (UT) UNIVERSAL TIME - Common standard for astrological calculations related to Greenwich/GB. GMT should not be used as a time zone (-see WET).
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ Calendar items are created in Outlook by using Coordinated Universal Time (UTC) format.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

[6][7]
.Canadian Sir Sandford Fleming proposed a worldwide system of time zones in 1879. He advocated his system at several international conferences, thus widely credited with their invention.^ International time zones - world clock .
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ The most important time zone to know is GMT and thus the reason why it is placed at the top of the list.
  • →    List of Time Zone Abbreviations — What Do Time Zone Abbreviations Means 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

^ Time zone information for Outlook is obtained from the Windows operating system in which the calendar items are created and is obtained at the time that the calendar items are created.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.In 1876, his first proposal was for a global 24-hour clock, conceptually located at the center of the Earth and not linked to any surface meridian.^ HOUR_OF_DAY is used for the 24-hour clock.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.In 1879 he specified that his universal day would begin at the anti-meridian of Greenwich (180th meridian), while conceding that hourly time zones might have some limited local use.^ Parameters: zone - the time zone to use aLocale - the locale for the week data .
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ ORA_TZFILE , which specifies the Oracle time zone file used by the database .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Calendar getInstance ( Locale  aLocale) Gets a calendar using the default time zone and specified locale.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.He also proposed his system at the International Meridian Conference in October 1884, but it did not adopt his time zones because they were not within its purview.^ International time zones - world clock .
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Please take note that there are irregularities with time zones because they don't always follow the exact longitudes.
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ Time zone information for Outlook is obtained from the Windows operating system in which the calendar items are created and is obtained at the time that the calendar items are created.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

The conference did adopt a universal day of 24 hours beginning at Greenwich midnight, but specified that it "shall not interfere with the use of local or standard time where desirable".
.Nevertheless, most major countries had adopted hourly time zones by 1929. Today, all nations use standard time zones for secular purposes, but they do not all apply the concept as originally conceived.^ My time zone is Eastern Standard Time (-5).
  • Time Zone Bugs « Woopra Forums 6 February 2010 13:45 UTC www.woopra.com [Source type: General]

^ Most neighboring cities use the same time zone settings.
  • Inventions: Time Zones - EnchantedLearning.com 6 February 2010 13:45 UTC www.enchantedlearning.com [Source type: FILTERED WITH BAYES]

^ Use a map of times zones for the following: 1.
  • Time Zone Lookup: Providers and Solutions | Business.com 14 January 2010 14:54 UTC www.business.com [Source type: News]

.Newfoundland, India, Iran, Afghanistan, Venezuela, Burma, the Marquesas, as well as parts of Australia use half-hour deviations from standard time, and some nations, such as Nepal, and some provinces, such as the Chatham Islands, use quarter-hour deviations.^ Similar to Nepal, Chatham Island which is part of New Zealand , is on the 45 also!
  • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

^ In a few regions, half-hour or quarter-hour differences are in effect.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ As a result, French Frigate Shoals along with Tern Island and Kure Island all have a 1 hour time difference compared to mainland Hawaii.
  • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

.Some countries, most notably China and India, use a single time zone, even though the extent of their territory far exceeds 15° of longitude.^ The United Kingdom has eight time zones for itself and its overseas territories.Canada has six official time zones.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Many countries, or even parts of countries, adopt daylight saving time (also known as Summer Time) during part of the year.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Standard time zones (Winter Time zones) can be defined by geometrically subdividing the Earth's spheroid into 24 lunes (wedge-shaped sections), bordered by meridians each 15 of longitude apart.
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

.Before 1949 China used five time zones (see Time in China).^ If the definition matches, the tool can rewrite the appointment by using the "new version" of the time zone information.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Using the /Quiet option in a time zone move operation .
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ GMT  GREENWICH MEAN TIME  also  (UT) UNIVERSAL TIME - Common standard for astrological calculations related to Greenwich/GB. GMT should not be used as a time zone (-see WET).
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

Nautical time zones

.Since the 1920s a nautical standard time system has been in operation for ships on the high seas.^ Returns the date and time of the operating system on which the database resides, taking into account the time zone of the database server's operating system that was in effect when the database was started .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ As new updates become available, all Windows operating systems will receive time zone updates through Windows Update and Microsoft Update.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ The operating system is not updated to accommodate the new time zone rules.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.Nautical time zones are an ideal form of the terrestrial time zone system.^ Nautical time zones .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ Nautical time zones are an ideal form of the terrestrial time zone system.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Changing the system date, time and/or time zone .
  • Aaron Margosis' "Non-Admin" and App-Compat WebLog : Changing the system date, time and/or time zone 6 February 2010 13:45 UTC blogs.msdn.com [Source type: FILTERED WITH BAYES]

.Under the system, a time change of one hour is required for each change of longitude by 15°.^ Adjusts item during extended DST period by one hour Stamps the time zone property on the items .
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ The concept of the patch date is replaced by the time at which the local time zone was changed on the operating system.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ However, the system time on the computer is off by one hour during the extended DST period.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.The 15° gore that is offset from GMT or UT1 (not UTC) by twelve hours is bisected by the nautical date line into two 7.5° gores that differ from GMT by ±12 hours.^ TIMESTAMP '1999-01-15 8:00:00 -8:00' TIMESTAMP '1999-01-15 11:00:00 -5:00' You can replace the UTC offset with the TZR (time zone region) format element.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ The date format in the example includes a two-digit number for the day of the month, an abbreviation of the month name, the last two digits of the year, and a 24-hour time designation.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ All-day events will span two days because these events are associated with 24 specific hours instead of an individual date.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.A nautical date line is implied but not explicitly drawn on time zone maps.^ Nautical time zones .
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ The time zone map is out of date, however.
  • Sources for Time Zone and Daylight Saving Time Data 6 February 2010 13:45 UTC www.twinsun.com [Source type: FILTERED WITH BAYES]

^ Look at the time zone map.
  • Greenwich and World Time Zones 6 February 2010 13:45 UTC www.coe.ilstu.edu [Source type: News]

It follows the 180th meridian except where it is interrupted by territorial waters adjacent to land, forming gaps: it is a pole-to-pole dashed line.[8][9][10]
.A ship within the territorial waters of any nation would use that nation's standard time, but would revert to nautical standard time upon leaving its territorial waters.^ Iran does use a non–standard time offset , meaning instead of being on the hour they are on the half hour.
  • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

^ Arizona and Hawaii use standard time throughout the year.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]

.The captain was permitted to change the ship's clocks at a time of the captain’s choice following the ship's entry into another time zone.^ International time zones - world clock .
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ The following information is also included for each time zone: .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ It contains time zones that have changed from version 1 to version 2.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

The captain often chooses midnight.

Skewing of zones

Difference between sun time and clock time during daylight saving time:
0h ± 30m
1h ± 30m ahead
2h ± 30m ahead
3h ± 30m ahead
.Ideal time zones, such as nautical time zones, are based on the mean solar time of a particular meridian located in the middle of that zone with boundaries located 7.5 degrees east and west of the meridian.^ Nautical time zones .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ File:Time zones of Europe.svg Spain and France (in red) in relation to Greenwich Mean Time (in purple) Ideal time zones, such as nautical time zones, are based on the mean solar time of a particular meridian located in the middle of that zone with boundaries located 7.5 degrees east and west of the meridian.
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ There is a tendency to draw time zone boundaries far to the west of their meridians.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.In practice, zone boundaries are often drawn much farther to the west with often irregular boundaries, and some locations base their time on meridians located far to the east.^ There is a tendency to draw time zone boundaries far to the west of their meridians.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Of course, actual time zones have irregular boundaries, so this is only approximate.
  • Units: T 14 January 2010 14:54 UTC www.unc.edu [Source type: Reference]

^ In practice, zone boundaries are often drawn much farther to the west with often irregular boundaries, and some locations base their time on meridians located far to the east.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

.For example, even though the Prime Meridian (0°) passes through Spain and France, they use the mean solar time of 15 degrees east (Central European Time) rather than 0 degrees (Greenwich Mean Time).^ GMT  GREENWICH MEAN TIME  also  (UT) UNIVERSAL TIME - Common standard for astrological calculations related to Greenwich/GB. GMT should not be used as a time zone (-see WET).
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ Middle European Double S. Time,  -Mainly used in Germany (1945 & 1947)  Doppelte Deutsche Sommerzeit .
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ For example, if you create an appointment by using previous time zone rules and then view the appointment under new time zone rules, the appointment time is shifted by one hour.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.France previously used GMT, but was switched to CET (Central European Time) during the German occupation of the country during World War II and did not switch back after the war.^ Many countries, or even parts of countries, adopt daylight saving time (also known as Summer Time) during part of the year.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ DBTIMEZONE : Oracle uses the database time zone established (explicitly or by default) during database creation.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ For example, if you create an appointment by using previous time zone rules and then view the appointment under new time zone rules, the appointment time is shifted by one hour.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

[citation needed]
.There is a tendency to draw time zone boundaries far to the west of their meridians.^ There is a tendency to draw time zone boundaries far to the west of their meridians.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Time zone boundaries .
  • Sources for Time Zone and Daylight Saving Time Data 6 February 2010 13:45 UTC www.twinsun.com [Source type: FILTERED WITH BAYES]

^ The Prime Meridian is in the center of this time zone.
  • Greenwich and World Time Zones 6 February 2010 13:45 UTC www.coe.ilstu.edu [Source type: News]

.Many of these locations also use daylight saving time.^ Transition times for Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Abbreviations for standard time and Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Daylight Saving Time is not calculated for regions that do not use Daylight Saving Time.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

As a result, in the summer, solar noon in the Spanish town of Muxia occurs on 14:37 by the clock. .This area of Spain never experiences sunset before 18:00 (6pm) local time even in midwinter, despite its lying more than 40 degrees north of the equator.^ SQL> INSERT INTO table_tsltz VALUES(1, '01-JAN-2003 2:00:00'); Insert the same data as a TIMESTAMP WITH LOCAL TIME ZONE literal.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Oracle Database SQL Reference for more information about the TIMESTAMP WITH LOCAL TIME ZONE datatype .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ US/Pacific US/Pacific-New US/Samoa UTC W-SU WET The default time zone file contains more than 350 unique time zone names.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.Near the summer solstice, Muxia has sunset times similar to those of Stockholm, which is in the same time zone and 16 degrees further north.^ SQL> INSERT INTO table_tsltz VALUES(1, '01-JAN-2003 2:00:00'); Insert the same data as a TIMESTAMP WITH LOCAL TIME ZONE literal.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Also, all databases and client installations that share information must use the same time zone file.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ A: The Time Zone Data Update Tool updates only those meetings for which the user is the organizer.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.A more extreme example is Nome, Alaska, which is at 165°24′W longitude—just west of center of the idealized Samoa Time Zone (165°W).^ Standard time zones (Winter Time zones) can be defined by geometrically subdividing the Earth's spheroid into 24 lunes (wedge-shaped sections), bordered by meridians each 15 of longitude apart.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Please take note that there are irregularities with time zones because they don't always follow the exact longitudes.
  • Taeger Archives (International Time Zones Abbreviations) 6 February 2010 13:45 UTC www.iol.ie [Source type: FILTERED WITH BAYES]

^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

.Nevertheless, Nome observes Alaska Time (135°W) with DST so it is slightly more than two hours ahead of the sun in winter and over three in summer.^ Consider the following scenarios: An organizer in the Pacific Time zone has a meeting that is scheduled with an attendee in an area that does not observe DST, such as an attendee in Arizona or Hawaii.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ However, the system time on the computer is off by one hour during the extended DST period.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Appointments or meetings that are scheduled by a user who is not in a time zone that is affected by the DST changes are incorrectly shifted forward by one hour.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

[11] .Kotzebue, Alaska, also near the same meridian but north of the Arctic Circle, has an annual event on 9 August to celebrate two sunsets the same day, one shortly after midnight and the other shortly before midnight.^ Therefore, items that are created on the same day in which the update was applied but before the update was applied will not be rebased.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ All-day events will span two days because these events are associated with 24 specific hours instead of an individual date.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Two characters c1 and c2 are considered the same, ignoring case if at least one of the following is true: The two characters are the same (as compared by the == operator).
  • String (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

Also, China extends as far west as 73°34′E, but all parts of it use UTC+8 (120°E), so solar "noon" can occur as late as 15:00.

Daylight saving time

     DST used      DST no longer used      DST never used
.Many countries, or even parts of countries, adopt daylight saving time (also known as "Summer Time") during part of the year.^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Many countries, or even parts of countries, adopt daylight saving time (also known as Summer Time) during part of the year.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Abbreviations for standard time and Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.This typically involves advancing clocks by an hour near the start of spring and adjusting back in autumn ("spring" forward, "fall" back).^ This typically involves advancing clocks by an hour near the start of spring and adjusting back in autumn.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

.Some countries also use backward daylight saving over the winter period.^ Many countries, or even parts of countries, adopt daylight saving time (also known as Summer Time) during part of the year.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Canada The Institute for National Measurement Standards publishes current and some older information about Time Zones & Daylight Saving Time .
  • Sources for Time Zone and Daylight Saving Time Data 6 February 2010 13:45 UTC www.twinsun.com [Source type: FILTERED WITH BAYES]

^ Returns: true if this time zone uses daylight savings time, false, otherwise.
  • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

Modern DST was first proposed in 1907 and was in widespread use in 1916 as a wartime measure aimed at conserving coal. .Despite controversy, many countries have used it since then; details vary by location and change occasionally.^ Future subclasses could represent the various types of lunar calendars in use in many parts of the world.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ To determine or to see which cities or locations are in the various time zones around the world, be sure to use Time Genie 's Coordinated Universal Time (UTC) page.
  • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

.Most countries around the equator do not observe daylight saving time, since the seasonal difference in sunlight is minimal.^ Transition times for Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Abbreviations for standard time and Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Note: Daylight Saving Time began on March 8, 2009, and returns again to Standard Time November 1, 2009.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]

Additional information

.
  • France has twelve time zones including those of France, French Guiana and numerous islands, inhabited and uninhabited.^ France also has eleven time zones including those of France, French Guiana and numerous islands, inhabited and uninhabited.
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    ^ The following information is also included for each time zone: .
    • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
    • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

    ^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    .Russia has eleven time zones, ten contiguous zones plus Kaliningrad on the Baltic Sea.^ Russia has eleven time zones, including Kaliningrad on the Baltic Sea.
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    ^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    ^ France also has eleven time zones including those of France, French Guiana and numerous islands, inhabited and uninhabited.
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    .The United States have ten time zones (nine official plus that for Wake Island and its Antarctic stations; no official time zone is specified for uninhabited Howland Island and Baker Island).^ The United States has ten time zones (nine official plus that for Wake Island and its Antarctic stations).
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    ^ The United Kingdom has eight time zones for itself and its overseas territories.Canada has six official time zones.
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    ^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    .Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).^ This is the official description for time zones in Indonesia.
    • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

    ^ Note that an abbreviation can be associated with more than one time zone.
    • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
    • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

    ^ The United States has ten time zones (nine official plus that for Wake Island and its Antarctic stations).
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    .The United Kingdom has eight time zones for itself and its overseas territories.^ The United Kingdom has eight time zones for itself and its overseas territories.Canada has six official time zones.
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    ^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    ^ Visit our French Southern and Antarctic Territories to discover its 3 time zones which are UTC/GMT +4, +5 and +10!
    • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

    .Canada has six official time zones.
  • In terms of area, China is the largest country with only one time zone (UTC+08).^ This is the official description for time zones in Indonesia.
    • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

    ^ The United Kingdom has eight time zones for itself and its overseas territories.Canada has six official time zones.
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    ^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    .China also has the widest spanning time zone.^ China also has the widest spanning time zone.
    • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
    • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
    • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

    ^ Before the Communist control of the mainland in 1949 during the Chinese Civil War , China was separated into five time zones .
    • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

    ^ Before the Communist control of the mainland in 1949 during the Chinese Civil War , China was separated into five time zones.
    • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

    .Before 1949, China was separated into five time zones.
  • Stations in Antarctica generally keep the time of their supply bases, thus both the Amundsen-Scott South Pole Station (U.S.) and McMurdo Station (U.S.) use New Zealand time (UTC+12 southern winter, UTC+13 southern summer).
  • The 27°N latitude passes back and forth across time zones in South Asia.^ Time zones are divided into standard and daylight saving (or summer).
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    ^ Use the TIMESTAMP WITH TIME ZONE datatype when the application is used across time zones.
    • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
    • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

    ^ The most important time zone to know is GMT and thus the reason why it is placed at the top of the list.
    • →    List of Time Zone Abbreviations — What Do Time Zone Abbreviations Means 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

    .Pakistan: +05, India +05:30, Nepal +05:45, India (Sikkim) +05:30, China +08:00, Bhutan +06:00, India (Arunachal Pradesh) +05:30, Myanmar +06:30. This switching was more odd in 2002, when Pakistan enabled daylight saving time.^ Daylight Saving Time Session Parameter .
    • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
    • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

    ^ Examples: The Effect of Daylight Saving Time on Datetime Calculations .
    • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
    • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

    ^ This means the time zone that is entered ( -08:00 ) is converted to the session time zone value ( -07:00 ).
    • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
    • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

    .Thus from west to east, time zones were: +06:00, +05:30, +05:45, +05:30, +08:00, +06:00, +05:30 and +06:30.
  • Because the earliest and latest time zones are 26 hours apart, any given calendar date exists at some point on the globe for 50 hours.^ The Calendar returned is based on the current time in the given time zone with the given locale.
    • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

    ^ Parameters: value - the given time zone.
    • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

    ^ Time ( Date  date) Sets this Calendar's current time with the given Date.
    • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

    .For example, April 11 begins in time zone UTC+14 at 10:00 UTC April 10, and ends in time zone UTC−12 at 12:00 UTC April 12.
  • There are numerous places where three or more time zones meet, for instance at the tri-country border of Finland, Norway and Russia.
  • There are 40 time zones.^ Russia is the ultimate country for time zones because the country is so wide that it has to be separated into numerous time zones.
    • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

    ^ There are a few factors that determine the time or time zone that a country is located in.
    • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

    ^ To specify midnight (start of day), select “00 / 12 am” in the Hour-field and 00 in the Minutes field To specify noon (middle of day), select “12 / 12 pm” in the Hour-field and 00 in the Minutes field Advertising More information .
    • The World Clock – Time Zone Converter 14 January 2010 14:54 UTC www.timeanddate.com [Source type: News]

    .This is due to fractional hour offsets and zones with offsets larger than 12 hours near the International Date Line as well as one unofficial zone in Australia.^ DAY_OF_MONTH is a larger field than HOUR .
    • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

    ^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    ^ Throws: IndexOutOfBoundsException - if offset is negative, or count is negative, or offset+count is larger than data.length .
    • String (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

    .See the list of time zones.
  • The largest time gap along a political border is the 3.5 hour gap along the border of China (UTC+08) and Afghanistan (UTC+04:30).
  • One of the most unusual time zones is the Australian Central Western Time zone (CWST), which is a small strip of Western Australia from the border of South Australia west to 125.5°E, just before Caiguna.^ "Time Zone Names" for a list of valid time zones .
    • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
    • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

    ^ UTC+9:30, Australian daylight saving time rule) .

    ^ The local time in neighboring zones would differ by one hour.
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
    • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

    .It is 8¾ hours ahead of UTC (UTC+08:45) and covers an area of about 35,000 km2, larger than Belgium, but has a population of about 200. Although unofficial, it is universally respected in the area—without it, the time gap in standard time at 129°E (the WA/SA border) would be 1.5 hours.^ Added bullet to "Known Issues and limitations" section about New Zealand Standard Time.
    • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

    ^ Time Genie's Coordinated Universal Time (UTC) page is the most complete list for time zones on the Internet.
    • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

    ^ Calendar items are created in Outlook by using Coordinated Universal Time (UTC) format.
    • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

    See Time in Australia.

Internet and computer systems

UTC is often used on the Internet for meetings (i.e. IRC chats, news, shows and so on).[12] .For e-mail, the sender time zone is used to calculate the send time, but this time is recalculated by the receiver mail client, and shown according to the receiver time zone.^ If the definition matches, the tool can rewrite the appointment by using the "new version" of the time zone information.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Using the /Quiet option in a time zone move operation .
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Current time in Antarctica — main section Current time in Antarctica — country edition As we get confirmation about more research stations and the time zone used at the station, we will be adding more research stations to our Antarctica list.
  • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

.On websites with mainly domestic audiences local time is often used, sometimes with UTC in brackets: e.g.^ To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Calendar items are created in Outlook by using Coordinated Universal Time (UTC) format.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ International time zones, world time clock, world time zones, GMT / UTC / DST International time zones - World time clock - Current local time .
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

the international .English-language version of CNN includes GMT and Hong Kong Time,[13] whilst the US version shows Eastern Time.^ Consider the following scenario: A user who lives Tijuana, Mexico has the GMT -08:00 Pacific Time (US & Canada); Tijuana home time zone.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

[14] .US Eastern Time and Pacific Time are also used fairly commonly on many US-based English-language websites with global readership.^ Examples are ' PST ' for US/Pacific standard time and ' PDT ' for US/Pacific daylight time.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Consider the following scenario: A user who lives Tijuana, Mexico has the GMT -08:00 Pacific Time (US & Canada); Tijuana home time zone.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ US/Pacific US/Pacific-New US/Samoa UTC W-SU WET The default time zone file contains more than 350 unique time zone names.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

The format is based in the W3C Note "datetime".
.On the other hand, most modern computer operating systems include information about time zones, including the capability to automatically change the local time when daylight saving starts and finishes (see the article on daylight saving time for more details on this aspect).^ Updated the information about the Time Zone Data Update Tool.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ A datetime expression can include an AT LOCAL clause or an AT TIME ZONE clause.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

Operating systems

Unix

.Most Unix-like systems, including Linux and Mac OS X, keep system time as UTC (Coordinated Universal Time).^ The dates and times for these files are listed in Coordinated Universal Time (UTC).
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Calendar items are created in Outlook by using Coordinated Universal Time (UTC) format.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Returns the system date, including fractional seconds and time zone of the system on which the database resides .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.Rather than having a single time zone set for the whole computer, timezone offsets can vary for different processes.^ TimeZone getTimeZone () Gets the time zone.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ The time zone environment variables are: .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ TimeZone ( TimeZone  value) Sets the time zone with the given time zone value.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.Standard library routines are used to calculate the local time based on the current timezone, normally supplied to processes through the TZ environment variable.^ The Calendar returned is based on the current time in the given time zone with the given locale.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ The time zone environment variables are: .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ The Calendar returned is based on the current time in the default time zone with the default locale.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.This allows users in multiple timezones to use the same computer, with their respective local times displayed correctly to each user.^ This allows users in multiple timezones to use the same computer, with their respective local times displayed correctly to each user.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ However, their use is deprecated because the same abbreviation is often used for multiple time zones (for example, "CST" could be U.S. "Central Standard Time" and "China Standard Time"), and the Java platform can then only recognize one of them.
  • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • TimeZone | Android Developers 15 September 2009 4:16 UTC dev.android.com [Source type: FILTERED WITH BAYES]

^ Time zones are thus a compromise, relaxing the complex geographic dependence while still allowing local time to approximate the mean solar time.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.Timezone information is most commonly stored in a timezone database known as tz database (or sometimes zoneinfo or Olson format).^ Oracle Database SQL Reference for more information about literals, format elements such as MM , and the TO_DATE function .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Oracle Database SQL Reference also contains information about format elements.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ ORACLE_HOME/oracore/zoneinfo/readme.txt for detailed information about time zone file updates Oracle Database Upgrade Guide for upgrade information .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.In fact, many systems, including anything using the GNU C Library, can make use of this database.^ Returns the system date, including fractional seconds and time zone of the system on which the database resides .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

Microsoft Windows

.Windows-based computer systems normally keep system time as local time in a particular time zone.^ Operating system local time zone ( ' OS_TZ' ) .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
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^ For more information about how to update the operating system, click the following article number to view the article in the Microsoft Knowledge Base: 955839 (http://support.microsoft.com/kb/955839/ ) December 2008 cumulative time zone update for Microsoft Windows operating systems Download and run the Time Zone Data Update Tool from the Microsoft Download Center.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Returns the date and time of the operating system on which the database resides, taking into account the time zone of the database server's operating system that was in effect when the database was started .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.A system database of timezone information includes the offset from UTC and rules that indicate the start and end dates for daylight saving in each zone.^ The tz database - Provides specific information on the beginning and ending dates of daylight saving time for each zone and tracks time zones over the years.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ Month - The daylight saving time starting month.
  • SimpleTimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • SimpleTimeZone (Java 2 Platform SE 5.0) 6 February 2010 13:45 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ DST End date rule See DST Start date rule.
  • Local Time 14 January 2010 14:54 UTC www.boost.org [Source type: FILTERED WITH BAYES]

.Application software is able to calculate the time in various zones, but there is no standard way for users from multiple zones to use a single server and have their own local times presented to them other than with Windows 2003 Terminal Server.^ The user reinstalls the Windows time zone update.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ There is no literal for TIMESTAMP WITH LOCAL TIME ZONE , but TIMESTAMP literals and TIMESTAMP WITH TIME ZONE literals can be inserted into a TIMESTAMP WITH LOCAL TIME ZONE column.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Q: When will my Windows time zone definitions be updated if I am using Windows Vista?
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.Windows 2003 Terminal Servers allow remote computers to redirect their time zone settings to the Terminal Server so that users see the correct time for their time zone in their desktop/application sessions.^ The user uninstalls the Windows time zone update.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ The user reinstalls the Windows time zone update.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ You can regard the Terminal Server session as any other client computer.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.Terminal Services uses the server base time on the Terminal Server and the client time zone information to calculate the time in the session.^ The following information is also included for each time zone: .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
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^ You can regard the Terminal Server session as any other client computer.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Oracle drops the time zone information.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

By default, this feature is disabled.

Programming languages

Java

.While most application software will use the underlying operating system for timezone information, the Java Platform, from version 1.3.1, has maintained its own timezone database.^ If the definition matches, the tool can rewrite the appointment by using the "new version" of the time zone information.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Returns the date and time of the operating system on which the database resides, taking into account the time zone of the database server's operating system that was in effect when the database was started .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ ORACLE_HOME/oracore/zoneinfo/timezone.dat contains only the most commonly used time zones.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.This database will need to be updated whenever timezone rules change.^ Although you can use this tool to update calendar items for time zone rule changes, you can also use this tool to help move to a new time zone.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ The dates of DST may change from year to year, and users have to update their Microsoft Office Outlook calendar every time that DST law or rules change.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ The time zone files that are supplied with Oracle Database 10 g have been updated from version 1 to version 2 to reflect changes in transition rules for some time zone regions.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
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Sun provides a updater tool for this purpose.[15]
.As an alternative to the timezone information bundled with the Java Platform, programmers may choose to use the Joda-Time library.^ If the definition matches, the tool can rewrite the appointment by using the "new version" of the time zone information.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Also, all databases and client installations that share information must use the same time zone file.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ ORACLE_HOME/oracore/zoneinfo/timezone.dat contains only the most commonly used time zones.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

[16] .This library includes its own timezone data based on the frequently-updated tz database.^ To update these calendars, include the /FORCEREBASESUPPRESSALLUPDATES option when you run the Outlook Time Zone Data Update tool against all resource mailboxes.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ You can include these items by using the Details option in the Time Zone Data Update Tool to prevent them from being updated.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ A: The Time Zone Data Update Tool can detect that there are new rules for a given time zone based on a new concept of "dynamic time zone rules."
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

[17]

Javascript

There is very little in the way of timezone support for Javascript. .Essentially the programmer has to extract the UTC offset by instantiating a time object, getting a GMT time from it, and differencing the two.^ Extracts the UTC from a datetime with time zone offset .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ ISO [ "_" regional_code [ "_" variant] ] The geographical time zone identifier is derived from the offset to UTC. Origin for UTC is the Zero Meridian going through Greenwich.

^ Time zones where the sun rises earlier, have positive offsets to UTC and are marked with P (plus), time zones where the sun rises later, are marked with M (minus), followed by two digits for the hours and two digits for the minutes which specify the exact offset to UTC (without daylight saving time).

.This does not provide a solution for daylight savings variations.^ The orderdate1 column is of TIMESTAMP datatype, which does not use Daylight Saving Time information and thus does not adjust for the change that took place in the 8-hour interval.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
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^ The TIMESTAMP datatype does not accept time zone values and does not calculate Daylight Saving Time.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
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^ Set the time zone region to UTC. UTC does not use Daylight Saving Time.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

PHP

.The DateTime objects and related functions have been compiled into the PHP core since 5.2. This includes the ability to get and set the default script timezone, and DateTime is aware of its own timezone internally.^ If ERROR_ON_OVERLAP_TIME is set to FALSE (the default value), then Oracle interprets the ambiguous datetime as Standard Time.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

PHP.net provides extensive documentation on this.[18] As noted there, the most current timezone database can be implemented via the PECL timezonedb.

Python

.The standard module datetime stores and operates on the timezone information class tzinfo.^ Oracle Database SQL Reference for detailed information about datetime and interval arithmetic operations .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Oracle's datetime and interval datatypes and time zone support make it possible to store consistent information about the time of events and transactions.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

The third party pytz module provides access to the full tz database.[19]. .Negated time zone offset in seconds is stored time.timezone and time.altzone attributes.^ ISO [ "_" regional_code [ "_" variant] ] The geographical time zone identifier is derived from the offset to UTC. Origin for UTC is the Zero Meridian going through Greenwich.

^ Note Outlook 2007 does store target time zone information about single-instance appointments.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ A time zone is not only given by the offset in hours (and minutes) compared to UTC, but also by the rules for daylight saving time that apply to a certain region.

Smalltalk

.Each Smalltalk dialect comes with its own built-in classes for dates, times and timestamps, only a few of which implement the DateAndTime and Duration classes as specified by the ANSI Smalltalk Standard.^ IGNOREPATCHDATE The tool's new default behavior is to look up the update installation date for the specified time zone and to touch only the single-instance appointments that were created before the update installation date.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.VisualWorks provides a TimeZone class that supports up to 2 annually-recurring offset transitions, which are assumed to apply to all years (same behavior as Windows time zones.^ ISO [ "_" regional_code [ "_" variant] ] The geographical time zone identifier is derived from the offset to UTC. Origin for UTC is the Zero Meridian going through Greenwich.

^ Detailed behavior of the Time Zone Data Update Tool in specific situations .
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ To update these calendars, include the /FORCEREBASESUPPRESSALLUPDATES option when you run the Outlook Time Zone Data Update tool against all resource mailboxes.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

) Squeak provides a Timezone class that does not support any offset transitions. .Dolphin Smalltalk does not support time zones at all.^ Consider the following scenarios: An organizer in the Pacific Time zone has a meeting that is scheduled with an attendee in an area that does not observe DST, such as an attendee in Arizona or Hawaii.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ To update these calendars, include the /FORCEREBASESUPPRESSALLUPDATES option when you run the Outlook Time Zone Data Update tool against all resource mailboxes.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Note Outlook 2007 does store target time zone information about single-instance appointments.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.For full support of the tz database (zoneinfo) in a Smalltalk application (including support for any number of annually-recurring offset transitions, and support for different intra-year offset transition rules in different years) the third-party, open-source, ANSI-Smalltalk-compliant Chronos Date/Time Library is available for use with any of the following Smalltalk dialects: VisualWorks, Squeak or Dolphin.^ Not intended for use as an accurate time source.

^ You can use the following administrative template to create a Group Policy object to prevent the Change Calendar Time Zone Tool in Outlook 2007 from running.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ The Time Zone Data Update Tool is available to help users adapt to the changes in time zone rules.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

Databases

.Some databases allow storage of a datetime type having time zone information.^ If the definition matches, the tool can rewrite the appointment by using the "new version" of the time zone information.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Updated the information about the Time Zone Data Update Tool.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Note Outlook 2007 does store target time zone information about single-instance appointments.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

The SQL standard defines two standard time data types:
TIMESTAMP WITH TIME ZONE
TIMESTAMP WITHOUT TIME ZONE
.However, the standard has a somewhat naive understanding of time zones.^ However, if this recipient then runs the Outlook Time Zone Data Update tool, the item may be rebased again.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ However, after the items are updated, later runs of the Time Zone Data Update Tool will not detect the items for correction.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ However, some key differences exist between a time zone move operation and a time zone update operation.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

.It generally assumes a time zone can be specified by a simple offset from GMT. This causes problems when trying to do arithmetic on dates which span daylight saving time transitions or which span political changes in time zone rules.^ You move to a different time zone because of a change in time zone rules.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Click on a time zone for Daylight Saving Time (DST) transition dates and times.

^ This switch is not applicable for daylight saving time changes.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

Oracle

.Oracle Database is configured with a database time zone, and connecting clients are configured with session time zones.^ Returns the value of the database time zone.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ It normalizes the data to the database time zone every time the data is sent to and from a client.
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^ Database time zone ( dbtimezone ) .
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  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

Oracle Database uses two data types to store time zone information:
TIMESTAMP WITH TIME ZONE 
Stores date and time information with the offset from UTC
TIMESTAMP WITH LOCAL TIME ZONE 
Stores date and time information with respect to the dbtimezone (which cannot be changed so long as there is a column in the db of this type), automatically adjusting the date and time from the stored time zone to the client's session time zone.

PostgreSQL

.PostgreSQL uses the standard SQL data types but tries to impose an interpretation which avoids the problems described above.^ Applied Technologies Group Home  >   Navigation  >   Data Type Catalogue Project Version 3.0  >   CDT Catalogue  >   Time Zone Code Standard .

TIMESTAMP WITH TIME ZONE 
Stores date and time in UTC and converts to the client's local time zone (which could be different for each client) for display purposes.
TIMESTAMP WITHOUT TIME ZONE 
Stores date and time without any conversion on input or output.

See also

References

  1. ^ Bristol Time
  2. ^ Economics of Time ZonesPDF (1.89 MB)
  3. ^ Resolution concerning new standard time by Chicago
  4. ^ Cooper, Bruce Clement (Consultant Editor) The Classic Western American Railroad Routes. New York: Chartwell Books/Worth Press, 2010. ISBN 9780785825739; ISBN 0785825738; BINC: 3099794. pp 31
  5. ^ Cooper, Bruce C. Railway & Travel Guides and the Pacific Railroad Central Pacific Railroad Photographic History Museum 2005
  6. ^ Quirico Filopanti from scienzagiovane, Bologna University, Italy.
  7. ^ Gianluigi Parmeggiani (Osservatorio Astronomico di Bologna), The origin of time zones
  8. ^ Bowditch, Nathaniel. American Practical Navigator. Washington: Government Printing Office, 1925, 1939, 1975.
  9. ^ Hill, John C., Thomas F. Utegaard, Gerard Riordan. Dutton's Navigation and Piloting. Annapolis: United States Naval Institute, 1958.
  10. ^ Howse, Derek. .Greenwich Time and the Discovery of the Longitude.^ The prime meridian, corresponding to longitude 0° and passing through Greenwich, England, is the center of time zone zero.
    • Eyes on the Sky, Feet on the Ground: Chapter Three 6 February 2010 13:45 UTC hea-www.harvard.edu [Source type: FILTERED WITH BAYES]

    Oxford: Oxford University Press, 1980. ISBN 0-19-215948-8.
  11. ^ Doug O'Hara (2007-03-11). "Alaska: daylight stealing time". Far North Science. http://www.farnorthscience.com/2007/03/11/news-from-alaska/alaska-daylight-stealing-time/. Retrieved 2007-05-11. 
  12. ^ "Guidelines for Ubuntu IRC Meetings". Canonical Ltd.. 2008-08-06. https://wiki.ubuntu.com/BuildingCommunity/BookingUbuntuMeetingChannel. 
  13. ^ International CNN
  14. ^ United States CNN
  15. ^ Timezone Updater Tool
  16. ^ Joda-Time
  17. ^ tz database
  18. ^ DateTime
  19. ^ pytz module

External links


Travel guide

Up to date as of January 14, 2010
(Redirected to Time zones article)

From Wikitravel

This article is a travel topic.
.This is a list of countries, regions, and territories grouped by time zone.^ Listing 2 Check the database time zone .
  • DBAsupport.com : Oracle 9i Central : Oracle Time Zone 6 February 2010 13:45 UTC www.dbasupport.com [Source type: FILTERED WITH BAYES]

^ See also: complete time zones list .
  • World Time Zones - Local Time & Date - DST - Flightsim Aviation Zone - Number 1 Flight Simulation & Aviation Resource! - Flight Simulator, Aviation Databases 6 February 2010 13:45 UTC www.flightsimaviation.com [Source type: FILTERED WITH BAYES]

^ Predefined time zone lists include: .
  • mydnn.org > Modules > TimeZones 6 February 2010 13:45 UTC mydnn.org [Source type: FILTERED WITH BAYES]

.Although many time zones have descriptive names used by people in them, they are least ambiguously identified by their relationship to UTC (Universal Time, Co-ordinated).^ Useful for travelers or those with friends in many different time zones!
  • Time Zone Map - StumbleUpon 14 January 2010 14:54 UTC www.stumbleupon.com [Source type: FILTERED WITH BAYES]

^ People living in the central time zone (e.g.
  • Big Bucket - Archive – Time zone correction and mountain time 14 January 2010 14:54 UTC bigbucketsoftware.com [Source type: FILTERED WITH BAYES]

^ An easy to use time zone converter.
  • →    Time Zone Converters — Choose One Time Genie's Time Zone Converters 14 January 2010 14:54 UTC www.timegenie.com [Source type: News]

.UTC used to be called GMT (Greenwich Mean Time), after the Royal Observatory located in the Greenwich area of London.^ So when you hear "Zulu Time", it is known as Greenwich Mean Time (GMT).
  • World Clock Time Zones Chart 6 February 2010 13:45 UTC aglobalworld.com [Source type: FILTERED WITH BAYES]

^ This is the origin of Greenwich Mean Time, or GMT. For all practical purposes, GMT and UTC are the same.
  • Date, Time, and Time Zones for Red Hat Linux 6 February 2010 13:45 UTC www.vanemery.com [Source type: FILTERED WITH BAYES]

^ Kerio WebMail uses the GMT time.
  • 1.14  Time zones 6 February 2010 13:45 UTC manuals.kerio.com [Source type: FILTERED WITH BAYES]

.UTC is also sometimes called Z or Zulu time.^ In 1964 a new time scale called coordinated universal time (UTC) was adopted, which occasionally requires the addition of an extra second—the leap second—to the length of the UTC year.
  • Time Zone Origins 6 February 2010 13:45 UTC www.factmonster.com [Source type: FILTERED WITH BAYES]

^ For example, the Java type java.util.Date is a long (integer) value for the number of milliseconds since 00:00 (midnight) on January 1, 1970 in UTC (Universal Coordinated Time, sometimes also called GMT).
  • Working with Time Zones 6 February 2010 13:45 UTC www.w3.org [Source type: Reference]

^ UTC (Coordinated Universal Time - the modern implementation of Zulu time or GMT) is also shown.
  • Java Web Clock - INMS - NRC-CNRC 6 February 2010 13:45 UTC time5.nrc.ca [Source type: General]

A time may be written as e.g. .21:45Z with the Z indicating UTC. The "Z" is for "zero", and "Zulu" is the two-way radio pronunciation of "Z". It comes from the nautical system in which each time zone was assigned a letter.^ The system time zone.
  • MySQL :: MySQL 5.1 Reference Manual :: 9.7 MySQL Server Time Zone Support 6 February 2010 13:45 UTC dev.mysql.com [Source type: FILTERED WITH BAYES]
  • MySQL :: MySQL 5.0 Reference Manual :: 9.7 MySQL Server Time Zone Support 6 February 2010 13:45 UTC dev.mysql.com [Source type: FILTERED WITH BAYES]
  • WEB HOSTING MySQL Server Time Zone Support 6 February 2010 13:45 UTC knowledge.3essentials.com [Source type: FILTERED WITH BAYES]

^ Nautical time zones .

^ Changing the system date, time and/or time zone .
  • Aaron Margosis' "Non-Admin" and App-Compat WebLog : Changing the system date, time and/or time zone 6 February 2010 13:45 UTC blogs.msdn.com [Source type: FILTERED WITH BAYES]

.Time zones east of UTC and west of the International Date Line are specified by the number of hours ahead of UTC (e.g.^ Each zone is one hour behind the zone to its east.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ Time in each of the 12 zones east of Greenwich increases one hour for each zone.
  • Time Zone - MSN Encarta 15 September 2009 4:16 UTC encarta.msn.com [Source type: News]

^ If there is plus in your time zone, then subtract the number of hours.
  • Time zones - Arelith Wiki 6 February 2010 13:45 UTC arelith.wikia.com [Source type: FILTERED WITH BAYES]

.UTC+4); zones west of UTC and east of the Date Line are specified by the number of hours behind UTC (e.g.^ Each zone is one hour behind the zone to its east.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ Offset (long date) Returns the offset of this time zone from UTC at the specified date.
  • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ In international waters, time zone boundaries are meridians 15° apart, except that UTC−12 and UTC+12 are each 7.5° wide and are separated by the 180° meridian (not by the International Date Line, which is for land and territorial waters only).
  • Sources for Time Zone and Daylight Saving Time Data 6 February 2010 13:45 UTC www.twinsun.com [Source type: FILTERED WITH BAYES]

UTC-6). .Crossing the Date Line going eastward, clocks are turned back a full 24 hours, and vice versa in the opposite direction.^ In the fall, the clocks go back an hour and in the spring clocks go ahead an hour.
  • British Columbia Time Zones and Telephone Area Codes 6 February 2010 13:45 UTC www.bcadventure.com [Source type: News]

^ HOUR_OF_DAY is used for the 24-hour clock.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ It is similar to Greenwich Mean Time (GMT), except that UTC observes no daylight saving time (DST) and is based on a 24-hour clock.
  • Add, remove, or change time zones - Outlook - Microsoft Office Online 6 February 2010 13:45 UTC office.microsoft.com [Source type: General]

.(Note: The total span of time zones covers more than 24 hours because the Date Line jogs westward and eastward to keep certain national island groupings on the same calendar day, although they are not within a single time zone.^ Time Zones 6 days ago .
  • Time Zones - Ask Questions and Get Answers - Blurtit 6 February 2010 13:45 UTC www.blurtit.com [Source type: News]

^ Some zones north-south of each other in the mid Pacific differ by 24 hours in time: they have the same time of the day but differ by a full day.
  • Time Zone Map – Sitemap 6 February 2010 13:45 UTC www.jamesmaurer.com [Source type: News]
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

^ Time Zones 8 hours ago .
  • Time Zones - Ask Questions and Get Answers - Blurtit 6 February 2010 13:45 UTC www.blurtit.com [Source type: News]

)
.It is important to note that Zulu time is unaffected by Daylight Saving Time.^ Check here for Daylight Savings Time .

^ Boolean - whether or not we are in daylight savings time.
  • rtfm.etla.org ( Perl / Time::Zone ) 6 February 2010 13:45 UTC rtfm.etla.org [Source type: FILTERED WITH BAYES]

^ Arizona doesn't have daylight savings time.

Therefore, when Daylight Saving Time is in effect, Zulu time is one hour behind UTC.

Genealogy

Up to date as of February 01, 2010

From Familypedia

.A time zone is a region of the Earth that has adopted the same standard time, usually referred to as the local time.^ The milliseconds in day in standard local time.
  • SimpleTimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • TimeZone (CLDC 1.1) 15 September 2009 4:16 UTC www.cs.wichita.edu [Source type: FILTERED WITH BAYES]
  • TimeZone (Sun SPOT API [Green]) 15 September 2009 4:16 UTC www.sunspotworld.com [Source type: FILTERED WITH BAYES]
  • TimeZone (MID Profile) 15 September 2009 4:16 UTC cs.calvin.edu [Source type: FILTERED WITH BAYES]
  • SimpleTimeZone (Java 2 Platform SE 5.0) 6 February 2010 13:45 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ A time zone is a region of the Earth that has adopted the same standard time , usually referred to as the local time .

^ What time zone Central Standard Time (CST)?
  • CST: Central Standard Time (USA & Canada) - What's the time in Central Time Zone now? 14 January 2010 14:54 UTC wwp.central-standard-time.com [Source type: News]

.Most adjacent time zones are exactly one hour apart, and by convention compute their local time as an offset from UTC (see also Greenwich Mean Time).^ Each zone is one hour behind the zone to its east.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ Time in each of the 12 zones east of Greenwich increases one hour for each zone.
  • Time Zone - MSN Encarta 15 September 2009 4:16 UTC encarta.msn.com [Source type: News]

^ See also the world time zone map .
  • U.S. Time Zones 6 February 2010 13:45 UTC aa.usno.navy.mil [Source type: FILTERED WITH BAYES]

Standard Time Zones of the World as of 2005. (Some time zones have since changed)
.Standard time zones can be defined by geometrically subdividing the Earth's spheroid into 24 lunes (wedge-shaped sections), bordered by meridians each 15° of longitude apart.^ Therefore, the earth is divided into 24 time zones, each of which is approximately 15 degrees of longitude wide.
  • Greenwich and World Time Zones 6 February 2010 13:45 UTC www.coe.ilstu.edu [Source type: News]

^ (Some time zones have since changed) Standard time zones can be defined by geometrically subdividing the Earth's spheroid into 24 lunes (wedge-shaped sections), bordered by meridians each 15° of longitude apart.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

.The local time in neighbouring zones would differ by one hour.^ Each zone is one hour behind the zone to its east.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ Would love to be able to see stats in my local time zone.
  • OpenDNS Community > Idea Bank > Change the time zone for stats 6 February 2010 13:45 UTC ideabank.opendns.com [Source type: FILTERED WITH BAYES]

^ One Comment on “MySQL time zone different from system time zone” .
  • MySQL time zone different from system time zone | Racker Hacker 14 January 2010 14:54 UTC rackerhacker.com [Source type: General]

.However, political and geographical practicalities can result in irregularly-shaped zones that follow political boundaries or that change their time seasonally (as with daylight saving time), as well as being subject to occasional redefinition as political conditions change.^ Time Zone Calculator takes into account Daylight Saving...
  • time zone Resources | ZDNet 6 February 2010 13:45 UTC updates.zdnet.com [Source type: General]

^ It supports daylight savings/summer time zones.
  • Time Zone Worldwide Download - Free Download Time Zone Worldwide 14 January 2010 14:54 UTC www.softlist.net [Source type: General]

^ Arizona doesn't have daylight savings time.

.There are variations of the definitions of time zone which generally fall into two meanings: a time zone can represent a region where the local time is some fixed offset from a global reference (usually UTC), or a time zone can represent a region throughout which the local time is always consistent even though the offset may fluctuate seasonally.^ This variable represents the amount of offset from GMT (+ hours or - hours) at the local time zone.
  • Time Zone Change - NOVELL FORUMS 6 February 2010 13:45 UTC forums.novell.com [Source type: General]

^ Offset (long date) Returns the offset of this time zone from UTC at the specified date.
  • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ Offset (long date) Returns the offset of this time zone from UTC at the specified date.
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.Before the adoption of time zones, people used local solar time (originally apparent solar time, as with a sundial; and, later, mean solar time).^ Before the adoption of standard zones, towns set their own local times.
  • How Time Zones, Daylight Savings Work in U.S., World - TIME 6 February 2010 13:45 UTC www.time.com [Source type: News]

^ An easy to use time zone converter.
  • →    Time Zone Converters — Choose One Time Genie's Time Zone Converters 14 January 2010 14:54 UTC www.timegenie.com [Source type: News]

^ Parameters: zone - the time zone to use aLocale - the locale for the week data .
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.Mean solar time is the average over a year of apparent solar time.^ Mean solar time is the average over a year of apparent solar time.

^ Its difference from apparent solar time is the equation of time .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ Its difference from apparent solar time is the equation of time.

.Its difference from apparent solar time is the equation of time.^ The difference between the mean solar time and the true solar time is called the Equation of Time.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ Its difference from apparent solar time is the equation of time.

^ Its difference from apparent solar time is the equation of time .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

.This became increasingly awkward as railways and telecommunications improved, because clocks differed between places by an amount corresponding to the difference in their geographical longitude, which was usually not a convenient number.^ This became increasingly awkward as railways and telecommunications improved, because clocks differed between places by an amount corresponding to the difference in their geographical longitude, which was usually not a convenient number.

^ As telecommunications improved and with the expansion of the railways this became increasingly awkward.
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

^ This problem could be solved by synchronizing the clocks in all localities, but then in many places the local time would differ markedly from the solar time to which people are accustomed.

.This problem could be solved by synchronizing the clocks in all localities, but then in many places the local time would differ markedly from the solar time to which people are accustomed.^ This problem could be solved by synchronizing the clocks in all localities, but then in many places the local time would differ markedly from the solar time to which people are accustomed.

^ Synchronizing time with atomic clock servers.
  • Time zones downloads at VicMan 6 February 2010 13:45 UTC www.vicman.net [Source type: General]

^ This is not the local time on your clock.
  • Time and time zone settings - MozillaZine Knowledge Base 6 February 2010 13:45 UTC kb.mozillazine.org [Source type: General]

.Time zones are thus a compromise, relaxing the complex geographic dependence while still allowing local time to approximate the mean solar time.^ Sorry I mean "Change the time zone" above.
  • Chris Jackson's Semantic Consonance : Windows 7 Debugging Demo: Troubleshooting the Broken Microsoft Time Zone Utility 14 January 2010 14:54 UTC blogs.msdn.com [Source type: General]

^ Approximately how wide is each time zone?
  • Greenwich and World Time Zones 6 February 2010 13:45 UTC www.coe.ilstu.edu [Source type: News]

^ Time zones are thus a compromise, relaxing the complex geographic dependence while still allowing local time to approximate the mean solar time.

.There has been a general trend to push the boundaries of time zones further west of their designated meridians in order to create a permanent daylight saving time effect.^ There has been a general trend to push the boundaries of time zones farther west of their designated meridians in order to create a permanent daylight saving time effect.

^ Time Zone Calculator takes into account Daylight Saving...
  • time zone Resources | ZDNet 6 February 2010 13:45 UTC updates.zdnet.com [Source type: General]

^ It supports daylight savings/summer time zones.
  • Time Zone Worldwide Download - Free Download Time Zone Worldwide 14 January 2010 14:54 UTC www.softlist.net [Source type: General]

.The increase in worldwide communication has further increased the need for interacting parties to communicate mutually comprehensible time references to one another.^ The increase in worldwide communication has further increased the need for interacting parties to communicate mutually comprehensible time references to one another.

^ Interact, share, and communicate with developers worldwide.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ Half a day is plenty of time to communicate with one another.
  • Getting Real: The alone time zone - Signal vs. Noise (by 37signals) 6 February 2010 13:45 UTC 37signals.com [Source type: Original source]

Contents

Standard time zones

.Earlier, time zones based their time on Greenwich Mean Time (GMT, also called UT1), the mean solar time at longitude 0° (the Prime Meridian).^ So when you hear "Zulu Time", it is known as Greenwich Mean Time (GMT).
  • World Clock Time Zones Chart 6 February 2010 13:45 UTC aglobalworld.com [Source type: FILTERED WITH BAYES]

^ In maritime usage, GMT retains its historical meaning of UT1, the mean solar time at Greenwich.

^ The difference between the mean solar time and the true solar time is called the Equation of Time.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

.But as a mean solar time, GMT is defined by the rotation of the Earth, which is not constant in rate.^ But as a mean solar time, GMT is defined by the rotation of the Earth, which is not constant in rate.

^ Unfortunately the Earth does not rotate at exactly a constant rate.
  • World Clock Time Zones Chart 6 February 2010 13:45 UTC aglobalworld.com [Source type: FILTERED WITH BAYES]

^ You may choose a time zone from the provided list or you can just enter an offset from the GMT (Greenwich Mean Time).
  • Time Zone Clock right in your Taskbar Clock - 1st Clock 5. 6 February 2010 13:45 UTC www.1stclock.com [Source type: General]

.So, the rate of atomic clocks was annually changed or steered to closely match GMT. But on January 1, 1972 it became fixed, using predefined leap seconds instead of rate changes.^ So, the rate of atomic clocks was annually changed or steered to closely match GMT. But on January 1 , 1972 it became fixed, using predefined leap seconds instead of rate changes.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ So, the rate of atomic clocks was annually changed or steered to closely match GMT. But on January 1, 1972 it became fixed, using predefined leap seconds instead of rate changes.

^ Coordinated Universal Time (UTC) is measured using highly accurate atomic clocks and synchronized periodically to UT by the addition or subtraction of seconds.
  • A Guide To Metric Time: Universal & Local Time 6 February 2010 13:45 UTC zapatopi.net [Source type: FILTERED WITH BAYES]

.This new time system is Coordinated Universal Time (UTC).^ All time zones are defined relative to Coordinated Universal Time (UTC).
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

^ The dates and times for these files are listed in Coordinated Universal Time (UTC).
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]
  • 2007 time zone update for Windows XP and Windows Server 2003 14 January 2010 14:54 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Time offsets from Coordinated Universal Time (UTC) .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.Leap seconds are inserted to keep UTC within 0.9 seconds of UT1. In this way, local times continue to correspond approximately to mean solar time, while the effects of variations in Earth's rotation rate are confined to simple step changes that can be easily subtracted if a uniform time scale (International Atomic Time or TAI) is desired.^ But as a mean solar time, GMT is defined by the rotation of the Earth, which is not constant in rate.

^ UTC is the international time standard.
  • Add, remove, or change time zones - Outlook - Microsoft Office Online 6 February 2010 13:45 UTC office.microsoft.com [Source type: General]

^ Leap seconds are inserted to keep UTC within 0.9 seconds of UT1.

.With the implementation of UTC, nations began to use it in the definition of their time zones instead of GMT. As of 2005, most but not all nations have altered the definition of local time in this way (though many media outlets fail to make a distinction between GMT and UTC).^ Many of them denote the time zones.
  • How do I determine what time zone I'm in if I go from one state to another? 6 February 2010 13:45 UTC askville.amazon.com [Source type: General]

^ All times are GMT -8.
  • Heart Zone Training - Dr. Kuri LapBand� Surgery Discussion Forum 6 February 2010 13:45 UTC forum.lapbandsurgery.com [Source type: General]
  • Monutain Time Zone - when did "Once Upon a Time in Springfield" air? - No Homers Club 14 January 2010 14:54 UTC www.nohomers.net [Source type: FILTERED WITH BAYES]

^ Parameters: zone - the time zone to use aLocale - the locale for the week data .
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.Further change to the basis of time zones may occur if proposals to abandon leap seconds succeed.^ Further change to the basis of time zones may occur if proposals to abandon leap seconds succeed.

^ Functionally the watch as the time and a second time zone.
  • Richard Mille RM022 Aerodyne Dual Time Zone Watch - Now With More Orthorhombic Titanium Aluminides! | aBlogtoRead.com 14 January 2010 14:54 UTC ablogtoread.com [Source type: FILTERED WITH BAYES]

^ Change the Time zone of the POA in Groupwise > > 3.
  • Time Zone Change - NOVELL FORUMS 6 February 2010 13:45 UTC forums.novell.com [Source type: General]

.Due to daylight saving time, UTC is local time at the Royal Observatory only between 01:00 UTC on the last Sunday in October and 01:00 UTC on the last Sunday in March.^ Last Saturday in September, at 2:00 local daylight saving time .

^ First of April, at 0:00 local daylight saving time .

^ UTC+5:30, no daylight saving time) .

.For the rest of the year, local time there is UTC+1, known in the United Kingdom as British Summer Time (BST).^ For the rest of the year, local time there is UTC+1 , known in the United Kingdom as British Summer Time (BST).
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ This is usually either UTC or local time.
  • Working with Time Zones 6 February 2010 13:45 UTC www.w3.org [Source type: Reference]

^ This is the offset to add to UTC to get local time.
  • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.Similar circumstances apply in many places.^ Similar circumstances apply in many places.

.The definition for time zones can be written in short form as UTC±n (or GMT±n), where n is the offset in hours.^ The time zone displays are customizable to the hour and minute offset necessary.
  • Time zone free software - Diet Calc Free, Time Zones Clock, DS Clock... 6 February 2010 13:45 UTC www.giveawayoftheday.com [Source type: General]

^ This variable represents the amount of offset from GMT (+ hours or - hours) at the local time zone.
  • Time Zone Change - NOVELL FORUMS 6 February 2010 13:45 UTC forums.novell.com [Source type: General]

^ Parameters: offsetMillis - the given base time zone offset to GMT. .
  • Java 2 Platform SE v1.3: Class TimeZone 15 September 2009 4:16 UTC www.cs.sunysb.edu [Source type: FILTERED WITH BAYES]
  • TimeZone (Danger API) 15 September 2009 4:16 UTC developer.danger.com [Source type: FILTERED WITH BAYES]

.These examples give the local time at various locations at 12:00 UTC when daylight saving time (or summer time, etc.^ Last Saturday in September, at 2:00 local daylight saving time .

^ First of April, at 0:00 local daylight saving time .

^ UTC+5:30, no daylight saving time) .

) is not in effect:
.Where the adjustment for time zones results in a time at the other side of midnight from UTC, then the date at the location is one day later or earlier.^ If ‘Zone Stepped’ scrolling is selected then each time zone is displayed one after the other.

^ Offset (long date) Returns the offset of this time zone from UTC at the specified date.
  • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ Offset (long date) Returns the offset of this time zone from UTC at the specified date.
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

Some examples when UTC is 23:00 on Monday when daylight saving time is not in effect:
Some examples when UTC is 02:00 on Tuesday when daylight saving time is not in effect:
.The time-zone adjustment for a specific location may vary because of Daylight Saving Time.^ Specifically, the Daylight Bias which tells the calendar what time it is during Daylight Savings Time.
  • 8500/Tilt loses time zone bias setting and makes some calendar entries wrong - AT&T/HTC - Wireless Forums from AT&T 14 January 2010 14:54 UTC forums.wireless.att.com [Source type: FILTERED WITH BAYES]

^ The utility automatically adjusts the time for time zone and daylight saving time offsets.

^ Time Zone Calculator takes into account Daylight Saving...
  • time zone Resources | ZDNet 6 February 2010 13:45 UTC updates.zdnet.com [Source type: General]

.For example New Zealand, which is usually UTC+12, observes a one-hour daylight saving time adjustment during the southern hemisphere summer, resulting in a local time of UTC+13.^ It supports daylight savings/summer time zones.
  • Time Zone Worldwide Download - Free Download Time Zone Worldwide 14 January 2010 14:54 UTC www.softlist.net [Source type: General]

^ The time indicates in local time when to apply standard or daylight savings time.
  • Changing ZCS Time Zones - Zimbra :: Wiki 6 February 2010 13:45 UTC wiki.zimbra.com [Source type: FILTERED WITH BAYES]

^ Arizona doesn't have daylight savings time.

.See also Sidereal time.^ See also Sidereal time, Calculating local time .

^ See also: Sidereal time Calculating local time .
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

^ See also Sidereal time .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

History

.Greenwich Mean Time (GMT) was established in 1675, when the Royal Observatory was built, as an aid to determine longitude at sea by mariners.^ So when you hear "Zulu Time", it is known as Greenwich Mean Time (GMT).
  • World Clock Time Zones Chart 6 February 2010 13:45 UTC aglobalworld.com [Source type: FILTERED WITH BAYES]

^ Greenwich Mean Time (GMT) was established in 1675 as an aid to determine longitude at sea by mariners.

^ Difference with Greenwich Mean Time in hours (GMT) .
  • eBay Premier: Help : Basics : Time Zone Conversion 6 February 2010 13:45 UTC pages.ebay.com [Source type: General]

.The first time zone in the world was established by British railways on December 1, 1847 — with GMT hand-carried on chronometers.^ The first time zone in the world was established by British railways on December 1, 1847 — with GMT hand-carried on chronometers.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ The first time zone in the world was established by British railways on December 1 , 1847 — with GMT hand-carried on chronometers .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ World clock and time zones.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.About August 23, 1852, time signals were first transmitted by telegraph from the Royal Observatory.^ About August 23, 1852, time signals were first transmitted by telegraph from the Royal Observatory, Greenwich.

^ About August 23 , 1852 , time signals were first transmitted by telegraph from the Royal Observatory .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ About August 23, 1852, time signals were first transmitted by telegraph from the Royal Greenwich Observatory.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

.Even though 98% of Great Britain's public clocks were using GMT by 1855, it was not made Britain's legal time until August 2, 1880.^ Even though 98% of Great Britain 's public clocks were using GMT by 1855, it was not made Britain's legal time until August 2, 1880.

^ Even though 98% of Great Britain's public clocks were using GMT by 1855, it was not made Britain's legal time until August 2, 1880.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ Even though 98% of Great Britain 's public clocks were using GMT by 1855, it was not made Britain's legal time until August 2 , 1880 .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

.Some old clocks from this period have two minute hands — one for the local time, one for GMT.[1] This only applied to the island of Great Britain, and not to the island of Ireland.^ This only applied to the island of Great Britain, and not to the island of Ireland.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ Some old clocks from this period have two minute hands — one for the local time, one for GMT .

^ This one will create a time one hour ahead of my local time (which is GMT +1).
  • Ask Tom "unix time to oracle time" 6 February 2010 13:45 UTC asktom.oracle.com [Source type: FILTERED WITH BAYES]

.On November 2, 1868, New Zealand (then a British colony) officially adopted a standard time to be observed throughout the colony, and was perhaps the first country to do so.^ England was the first country to adopt standardized time, with the railways forcing the issue.

^ The railway s were the first to adopt the idea and by 1890 all countries had adopted the Standard Time system.
  • Time zone@Everything2.com 6 February 2010 13:45 UTC everything2.com [Source type: FILTERED WITH BAYES]
  • Time zone@Everything2.com 14 January 2010 14:54 UTC www.everything2.com [Source type: FILTERED WITH BAYES]

^ This standard was known as New Zealand Mean Time.
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

.It was based on the longitude 172° 30' East of Greenwich, that is 11 hours 30 minutes ahead of GMT. This standard was known as New Zealand Mean Time.^ It was based on the longitude 172° 30' East of Greenwich , that is 11 hours 30 minutes ahead of Greenwich Mean Time .
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

^ (GMT-11:00) Samoa Standard Time .
  • Polycom VMC1000: Select Your Time Zone 14 January 2010 14:54 UTC vmc.ext.msstate.edu [Source type: News]

^ For example, "GMT+10" and "GMT+0010" mean ten hours and ten minutes ahead of GMT, respectively.
  • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.Timekeeping on the American railroads in the mid nineteenth century was somewhat confused.^ Timekeeping on the American railroads in the mid nineteenth century was somewhat confused.

.Each railroad used its own standard time, usually based on the local time of its headquarters or most important terminus, and the railroad's train schedules were published using its own time.^ Each railroad used its own standard time, usually based on the local time of its headquarters or most important terminus, and the railroad's train schedules were published using its own time.

^ The milliseconds in day in standard local time.
  • SimpleTimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • SimpleTimeZone (Java 2 Platform SE 5.0) 6 February 2010 13:45 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ The most accurate time base.
  • What Are Time Zones? 6 February 2010 13:45 UTC www.stargatefan.com [Source type: FILTERED WITH BAYES]

.Some major railroad junctions served by several different railroads had a separate clock for each railroad, each showing a different time; the main station in Pittsburgh, Pennsylvania, for example, kept six different times.^ Some major railroad junctions served by several different railroads had a separate clock for each railroad, each showing a different time.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ Some major railroad junctions served by several different railroads had a separate clock for each railroad, each showing a different time; the main station in Pittsburgh , Pennsylvania , for example, kept six different times.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ Some major railroad junctions served by several different railroads had a separate clock for each railroad, each showing a different time; the main station in Pittsburgh, Pennsylvania, for example, kept six different times.

.The confusion for travelers making a long journey involving several changes of train can be imagined.^ The confusion for travelers making a long journey involving several changes of train can be imagined.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ The confusion for travellers making a long journey involving several changes of train can be imagined.

^ Long train rides, particularly easterly and westerly trips, often required travelers to change their watches several times.
  • Eyes on the Sky, Feet on the Ground: Chapter Three 6 February 2010 13:45 UTC hea-www.harvard.edu [Source type: FILTERED WITH BAYES]

.Charles F. Dowd proposed a system of one-hour standard time zones for American railroads about 1863, although he published nothing on the matter at that time and did not consult railroad officials until 1869. In 1870, he proposed four ideal time zones (having north–south borders), the first centered on Washington, but by 1872 the first was centered 75°W of Greenwich, with geographic borders (for example, sections of the Appalachian Mountains).^ In 1870, he proposed four ideal time zones (having north–south borders), the first centered on Washington , but by 1872 the first was centered 75°W of Greenwich, with geographic borders (for example, sections of the Appalachian Mountains ).
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ How about Mountain Standard Time?
  • Which Time Zone? - Discussion » ChinesePod 6 February 2010 13:45 UTC chinesepod.com [Source type: General]

^ Each zone is one hour behind the zone to its east.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

.Dowd's system was never accepted by American railroads.^ Dowd's system was never accepted by American railroads.

^ Charles F. Dowd proposed a system of one-hour standard time zones for American railroads about 1863, although he published nothing on the matter at that time and did not consult railroad officials until 1869.

^ Multiple time zones were first proposed by Charles F. Dowd about 1863 for American railroads as a teacher to his students.
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

.Instead, U.S. and Canadian railroads implemented a version proposed William F. Allen, the editor of the Traveler's Official Railway Guide.^ Instead, U.S. and Canadian railroads implemented a version proposed William F. Allen, the editor of the Traveler's Official Railway Guide .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Instead, U.S. and Canadian railroads implemented their own version on Sunday, November 18, 1883, also called "The Day of Two Noons", when each railroad station clock was reset as standard-time noon was reached within each time zone.

^ Instead, U.S. and Canadian railroads implemented their own version on Sunday, November 18 , 1883 , also called "The Day of Two Noons", when each railroad station clock was reset as standard-time noon was reached within each time zone.
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

[2] .The borders of its time zones ran through railroad stations, often in major cities.^ The borders of its time zones ran through railroad stations, often in major cities.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ ISO [ "_" regional_code [ "_" variant] ] The geographical time zone identifier is derived from the offset to UTC. Origin for UTC is the Zero Meridian going through Greenwich.

^ Instead, U.S. and Canadian railroads implemented their own version on Sunday, November 18, 1883, also called "The Day of Two Noons", when each railroad station clock was reset as standard-time noon was reached within each time zone.

.For example, the border between its Eastern and Central time zones ran through Detroit, Buffalo, Pittsburgh, Atlanta, and Charleston.^ My time zone is Eastern Standard Time (-5).
  • Time Zone Bugs « Woopra Forums 6 February 2010 13:45 UTC www.woopra.com [Source type: General]

^ For example, the border between its Eastern and Central time zones ran through Detroit , Buffalo , Pittsburgh , Atlanta , and Charleston .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ The borders of its time zones ran through railroad stations, often in major cities.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.It was adopted on Sunday, November 18, 1883, also called "The Day of Two Noons", when each railroad station clock was reset as standard-time noon was reached within each time zone.^ My time zone is Eastern Standard Time (-5).
  • Time Zone Bugs « Woopra Forums 6 February 2010 13:45 UTC www.woopra.com [Source type: General]

^ Time Zones 6 days ago .
  • Time Zones - Ask Questions and Get Answers - Blurtit 6 February 2010 13:45 UTC www.blurtit.com [Source type: News]

^ We have to reset the clock and time zone, every time when we get to new > > locations.
  • travelling laptop - set time & time zone - Vista Forums 6 February 2010 13:45 UTC www.vistax64.com [Source type: General]

.The zones were named Intercolonial, Eastern, Central, Mountain, and Pacific.^ From east to west they are Eastern Standard Time (EST), Central Standard Time (CST), Mountain Standard Time (MST), Pacific Standard Time (PST), Alaskan Standard Time (AST), and Hawaii-Aleutian Standard Time (HST).
  • America Time Zones 6 February 2010 13:45 UTC www.classbrain.com [Source type: FILTERED WITH BAYES]

^ For example, the border between its Eastern and Central time zones ran through Detroit , Buffalo , Pittsburgh , Atlanta , and Charleston .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Pacific Time Vs Eastern Time Zone .
  • Time Zone Downloads - Time Zone Helper (DataMystic), Time Zone Calculator (Evercyber), ... 6 February 2010 13:45 UTC www.fileheap.com [Source type: General]

.Within one year, 85% of all cities with populations over 10,000, about 200 cities, were using standard time.^ How about Mountain Standard Time?
  • Which Time Zone? - Discussion » ChinesePod 6 February 2010 13:45 UTC chinesepod.com [Source type: General]

^ Within one year, 85% of all cities having populations over 10,000, about 200 cities, were using standard time.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

^ Within one year, 85% of all cities with populations over 10,000, about 200 cities, were using standard time.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

.A notable exception was Detroit (which is about half-way between the meridians of eastern time and central time), which kept local time until 1900, then tried Central Standard Time, local mean time, and Eastern Standard Time before a May 1915 ordinance settled on EST and was ratified by popular vote in August 1916. This hodgepodge ended when Standard zone time was formally adopted by the U.S. Congress on 19 March 1918 as the Standard Time Act.^ Eastern Standard time zone three hours before it began in the Pacific Standard time zone.
  • Time Zone Resource in OWL 6 February 2010 13:45 UTC www.w3.org [Source type: FILTERED WITH BAYES]

^ This hodgepodge was made uniform when Standard zone time was made legal by the United States Congress in 1918 .
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

^ A notable exception was Detroit, Michigan, which kept local time until 1900, then vacillated between Central Standard Time, local mean time, and Eastern Standard Time until it settled on EST by ordinance during May 1915, which was ratified by popular vote during August 1916.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

.Time zones were first proposed for the entire world by Canada's Sir Sandford Fleming in 1876 as an appendage to the single 24-hour clock he proposed for the entire world (located at the center of the Earth and not linked to any surface meridian).^ HOUR_OF_DAY is used for the 24-hour clock.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ Time zones world downloads at VicMan .
  • Time zones world downloads at VicMan 6 February 2010 13:45 UTC www.vicman.net [Source type: General]

^ More time zone links here: .

.In 1879 he specified that his universal day would begin at the anti-meridian of Greenwich (now called 180°), while conceding that hourly time zones might have some limited local use.^ Would love to be able to see stats in my local time zone.
  • OpenDNS Community > Idea Bank > Change the time zone for stats 6 February 2010 13:45 UTC ideabank.opendns.com [Source type: FILTERED WITH BAYES]

^ Time Zones 6 days ago .
  • Time Zones - Ask Questions and Get Answers - Blurtit 6 February 2010 13:45 UTC www.blurtit.com [Source type: News]

^ Parameters: zone - the time zone to use aLocale - the locale for the week data .
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.He continued to advocate his system at subsequent international conferences.^ He continued to advocate his system at subsequent international conferences.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

.In October 1884, the International Meridian Conference did not adopt his time zones because they were not within its purview.^ In October 1884, the International Meridian Conference did not adopt his time zones because they were not within its purview.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ In October 1884 the International Meridian Conference did not adopt his time zones because they were not within its purview.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

^ The Prime Meridian is in the center of this time zone.
  • Greenwich and World Time Zones 6 February 2010 13:45 UTC www.coe.ilstu.edu [Source type: News]

The conference did adopt a universal day of 24 hours beginning at Greenwich midnight, but specified that it "shall not interfere with the use of local or standard time where desirable".
.Nevertheless, most major countries had adopted hourly time zones by 1929. Today, all nations use standard time zones for secular purposes, but they do not all apply the concept as originally conceived.^ My time zone is Eastern Standard Time (-5).
  • Time Zone Bugs « Woopra Forums 6 February 2010 13:45 UTC www.woopra.com [Source type: General]

^ Most neighboring cities use the same time zone settings.
  • Inventions: Time Zones - EnchantedLearning.com 6 February 2010 13:45 UTC www.enchantedlearning.com [Source type: FILTERED WITH BAYES]

^ Use a map of times zones for the following: 1.
  • Time Zone Lookup: Providers and Solutions | Business.com 14 January 2010 14:54 UTC www.business.com [Source type: News]

.Newfoundland, India, Iran, Afghanistan, Burma, the Marquesas, as well as parts of Australia use half-hour deviations from standard time, and some nations, such as Nepal, and some provinces, such as the Chatham Islands, use quarter-hour deviations.^ Similar to Nepal, Chatham Island which is part of New Zealand , is on the 45 also!
  • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

^ Newfoundland , India, Iran, Afghanistan, Burma, the Marquesas , as well as parts of Australia use half-hour deviations from standard time, and some nations, such as Nepal , and some provinces, such as the Chatham Islands , use quarter-hour deviations.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ The island of Newfoundland, India, and parts of Australia use half-hour deviations from standard time, and some nations use quarter-hour deviations.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

Nautical time zones

Main article: Nautical time
.Since the 1920s a nautical standard time system has been in operation for ships on the high seas.^ Main article: Nautical time Since the 1920s a nautical standard time system has been in operation for ships on the high seas .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ In 1883 the railroads of the United States and Canada adopted a system for standard time and delineated the first time zones in North America.
  • Greenwich and World Time Zones 6 February 2010 13:45 UTC www.coe.ilstu.edu [Source type: News]

^ Since the continental United States spans such a great distance, it has been divided into four standard time zones; Eastern, Central, Mountain and Pacific.
  • Greenwich and World Time Zones 6 February 2010 13:45 UTC www.coe.ilstu.edu [Source type: News]

.Nautical time zones are an ideal form of the terrestrial time zone system.^ Nautical time zones .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ Nautical time zones are an ideal form of the terrestrial time zone system.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Changing the system date, time and/or time zone .
  • Aaron Margosis' "Non-Admin" and App-Compat WebLog : Changing the system date, time and/or time zone 6 February 2010 13:45 UTC blogs.msdn.com [Source type: FILTERED WITH BAYES]

.Under the system, a time change of one hour is required for each change of longitude by 15°.^ Changing the system date, time and/or time zone .
  • Aaron Margosis' "Non-Admin" and App-Compat WebLog : Changing the system date, time and/or time zone 6 February 2010 13:45 UTC blogs.msdn.com [Source type: FILTERED WITH BAYES]

^ It was designed for changing the system date and time."
  • Aaron Margosis' "Non-Admin" and App-Compat WebLog : Changing the system date, time and/or time zone 6 February 2010 13:45 UTC blogs.msdn.com [Source type: FILTERED WITH BAYES]

^ Under the system, a time change of one hour is required for each change of longitude by 15°.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.The 15° gore that is offset from GMT or UT1 (not UTC) by twelve hours is bisected by the nautical date line into two 7.5° gores that differ from GMT by ±12 hours.^ (GMT-12:00) International Date Line West .
  • Time Zones - Cities of Earth 3D Screensaver - Screenomania.com 6 February 2010 13:45 UTC www.screenomania.com [Source type: News]

^ The 15° gore that is offset from GMT or UT1 (not UTC ) by twelve hours is bisected by the nautical date line into two 7.5° gores that differ from GMT by ±12 hours.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ UTC + 12.75 Hours .
  • Can you name the most populous city in each time zone? - sporcle 6 February 2010 13:45 UTC www.sporcle.com [Source type: FILTERED WITH BAYES]

.A nautical date line is implied but not explicitly drawn on time zone maps.^ Nautical time zones .
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ The time zone map is out of date, however.
  • Sources for Time Zone and Daylight Saving Time Data 6 February 2010 13:45 UTC www.twinsun.com [Source type: FILTERED WITH BAYES]

^ Look at the time zone map.
  • Greenwich and World Time Zones 6 February 2010 13:45 UTC www.coe.ilstu.edu [Source type: News]

.It follows the 180th meridian except where it is interrupted by territorial waters adjacent to land, forming gaps: it is a pole-to-pole dashed line.^ It follows the 180th meridian except where it is interrupted by territorial waters adjacent to land, forming gaps: it is a pole-to-pole dashed line.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ In international waters, time zone boundaries are meridians 15° apart, except that UTC−12 and UTC+12 are each 7.5° wide and are separated by the 180° meridian (not by the International Date Line, which is for land and territorial waters only).
  • Sources for Time Zone and Daylight Saving Time Data 6 February 2010 13:45 UTC www.twinsun.com [Source type: FILTERED WITH BAYES]

^ Unlike the zig-zagging land-based International Date Line , the nautical International Date Line follows 180° except where it is interrupted by territorial waters and the lands they border, including islands.
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
  • Bambooweb: Time zone 14 January 2010 14:54 UTC www.bambooweb.com [Source type: FILTERED WITH BAYES]

.A ship within the territorial waters of any nation would use that nation's standard time, but would revert to nautical standard time upon leaving its territorial waters.^ A ship within the territorial waters of any nation would use that nation's standard time, but would revert to nautical standard time upon leaving its territorial waters.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ A ship within the territorial waters of any nation uses that nation's time.
  • Sources for Time Zone and Daylight Saving Time Data 6 February 2010 13:45 UTC www.twinsun.com [Source type: FILTERED WITH BAYES]

^ A ship within the territorial waters of any nation would use that nation's standard time.
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

.The captain was permitted to change his ship's clocks at a time of his choice following his ship's entry into another time zone—he often chose midnight.^ Change the Time zone of the POA in Groupwise 3.
  • Time Zone Change - NOVELL FORUMS 6 February 2010 13:45 UTC forums.novell.com [Source type: General]

^ A captain can change ship's clocks any time after entering a new time zone; midnight changes are common.
  • Sources for Time Zone and Daylight Saving Time Data 6 February 2010 13:45 UTC www.twinsun.com [Source type: FILTERED WITH BAYES]

^ OtherTime 1.3 -   Time zone clock in the Dock.
  • Time Zone Worldwide Download - Free Download Time Zone Worldwide 14 January 2010 14:54 UTC www.softlist.net [Source type: General]

.For airplanes, similar principles apply.^ For airplanes, similar principles apply.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

Skewing of zones

Spain and France (in red) in relation to Greenwich Mean Time (in purple)
.Ideal time zones, such as nautical time zones, are based on the mean solar time of a particular meridian located in the middle of that zone with boundaries located 7.5 degrees east and west of the meridian.^ Nautical time zones .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ File:Time zones of Europe.svg Spain and France (in red) in relation to Greenwich Mean Time (in purple) Ideal time zones, such as nautical time zones, are based on the mean solar time of a particular meridian located in the middle of that zone with boundaries located 7.5 degrees east and west of the meridian.
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ There is a tendency to draw time zone boundaries far to the west of their meridians.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.In practice, zone boundaries are often drawn much farther to the west with often irregular boundaries, and some locations base their time on meridians located far to the east.^ There is a tendency to draw time zone boundaries far to the west of their meridians.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Of course, actual time zones have irregular boundaries, so this is only approximate.
  • Units: T 14 January 2010 14:54 UTC www.unc.edu [Source type: Reference]

^ In practice, zone boundaries are often drawn much farther to the west with often irregular boundaries, and some locations base their time on meridians located far to the east.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

.For example, even though the Prime Meridian (0°) passes through Spain and France, they use the mean solar time of 15 degrees east (Central European Time) rather than 0 degrees (Greenwich Mean Time).^ The prime meridian, corresponding to longitude 0° and passing through Greenwich, England, is the center of time zone zero.
  • Eyes on the Sky, Feet on the Ground: Chapter Three 6 February 2010 13:45 UTC hea-www.harvard.edu [Source type: FILTERED WITH BAYES]

^ In the Netherlands and Belgium we use Central European Time (CET) in the winter , and this time is based on the meridian of 15 degrees east.
  • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

^ Understanding World Time Zones The zero degree longitude line or the Prime Meridian passes through Greenwich , a suburb of London.
  • Greenwich and World Time Zones 6 February 2010 13:45 UTC www.coe.ilstu.edu [Source type: News]

.France previously used GMT, but it was switched to CET during the German Occupation and did not switch back after the war.^ France previously used GMT, but it was switched to CET during the German Occupation and did not switch back after the war.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ France used to use GMT, but it was switched to CET during the German Occupation and did not switch back after the war.
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

.There is a tendency to draw time zone boundaries far to the west of their meridians.^ There is a tendency to draw time zone boundaries far to the west of their meridians.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Time zone boundaries .
  • Sources for Time Zone and Daylight Saving Time Data 6 February 2010 13:45 UTC www.twinsun.com [Source type: FILTERED WITH BAYES]

^ The Prime Meridian is in the center of this time zone.
  • Greenwich and World Time Zones 6 February 2010 13:45 UTC www.coe.ilstu.edu [Source type: News]

.Many of these locations also use daylight saving time which means that solar noon could occur later than 14:00 by the clock.^ How could these days be used?
  • Eyes on the Sky, Feet on the Ground: Chapter Three 6 February 2010 13:45 UTC hea-www.harvard.edu [Source type: FILTERED WITH BAYES]

^ Arizona doesn't have daylight savings time.

^ Transition times for Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.In a more extreme example, Nome is at 165°24′W longitude, which is just west of center of the idealized Samoa Time Zone (165°W).^ Some more examples for time zone identifiers: .

^ More time zone links here: .

^ In a more extreme example, Nome, Alaska is at 165°24′W longitude, which is just west of center of the idealized Samoa Time Zone (165°W).
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

.Nevertheless, Nome observes Alaska Time (135°W) with DST so it is slightly more than two hours ahead of the sun in winter and over three in summer.^ Nevertheless, Nome observes Alaska Time (135°W) with DST so it is slightly more than two hours ahead of the sun in winter and over three in summer.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ England used "Double Daylight Time," stepping ahead one hour in the winter and two hours in the summer.
  • Dr. Dobb's | Real Time Zones | October 1, 2001 6 February 2010 13:45 UTC www.ddj.com [Source type: FILTERED WITH BAYES]

^ Time zones where the sun rises earlier, have positive offsets to UTC and are marked with P (plus), time zones where the sun rises later, are marked with M (minus), followed by two digits for the hours and two digits for the minutes which specify the exact offset to UTC (without daylight saving time).

[3]
.Also, China extends as far west as 73°34′E, but all parts of it use UTC+8 (120°E), so noon can occur as late as 1:30 p.m.^ The continental U.S. used four zones, while all of similarly sized China used a single zone set to the Beijing (or Peking or Peiping.
  • Dr. Dobb's | Real Time Zones | October 1, 2001 6 February 2010 13:45 UTC www.ddj.com [Source type: FILTERED WITH BAYES]

^ However, administrators can use the /MAXAPPTS command-line parameter to stamp the time zone property on all appointments that occur inside and outside the future extended DST times.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Many of these locations also use daylight saving time which means that solar noon could occur later than 14:00 by the clock.
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

Daylight saving time

See also: Daylight saving time
.Many countries, or even parts only of countries, adopt daylight saving time during part of the year.^ Arizona doesn't have daylight savings time.

^ "D" if daylight saving time applies.

^ Daylight-saving time considerations .
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

.This typically involves advancing clocks by an hour near the start of spring and adjusting back in autumn.^ This typically involves advancing clocks by an hour near the start of spring and adjusting back in autumn .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ This typically involves advancing clocks by an hour near the start of spring and adjusting back in autumn.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ When the computer is turned back on, the software clock starts running again and sets itself (within 1 second) to the hardware clock.
  • Atomic Time Zone - Frequently Asked Questions 6 February 2010 13:45 UTC amo.net [Source type: FILTERED WITH BAYES]

.Some countries also use backward daylight saving over the winter period.^ Many countries, or even parts of countries, adopt daylight saving time (also known as Summer Time) during part of the year.
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

^ Canada The Institute for National Measurement Standards publishes current and some older information about Time Zones & Daylight Saving Time .
  • Sources for Time Zone and Daylight Saving Time Data 6 February 2010 13:45 UTC www.twinsun.com [Source type: FILTERED WITH BAYES]

^ Returns: true if this time zone uses daylight savings time, false, otherwise.
  • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.Modern DST was first proposed in 1907 and was widespread use in 1916 as a wartime measure aimed at conserving coal.^ Modern DST was first proposed in 1907 and was widespread use in 1916 as a wartime measure aimed at conserving coal .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.Despite controversy, many countries have used it since then; details vary by location and change occasionally.^ Despite controversy, many countries have used it since then; details vary by location and change occasionally.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ UTC on Tuesday, then the time in Honolulu is 20:00, Monday) The time zone adjustment for a specific location may vary due to the use of daylight saving time.
  • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

^ I’ve used it to win many a free drink, and if you want to learn how, the details are here .

Additional info

.
  • Russia has the largest number of time zones: eleven, including Kaliningrad on the Baltic Sea.^ In terms of the largest number of time zones, Russia is first, with eleven time zones, including Kaliningrad on the Baltic Sea.
    • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

    ^ Russia has eleven time zones, including Kaliningrad on the Baltic Sea.
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]

    ^ Russia has the largest number of time zones: eleven, including Kaliningrad on the Baltic Sea .
    • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

    .In terms of distinct time zones, Canada and the United States are tied for second with six, while Australia has seven time zones that always overlap to some degree.^ The United States is second with nine time zones, six for states and three more for possessions.
    • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

    ^ Canada is third with six time zones.
    • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

    ^ In terms of distinct time zones, Canada and the United States are tied for second with six, while Australia has seven time zones that always overlap to some degree.
    • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
    • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

    .See: Time in Russia
  • If the possessions of the United Kingdom, the United States and France are included it increases the number of time zones in each.^ The United States is second with nine time zones, six for states and three more for possessions.
    • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

    ^ See: Time in Russia If the possessions of the United Kingdom , the United States and France are included it increases the number of time zones in each.
    • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

    ^ Russia has eleven time zones, including Kaliningrad on the Baltic Sea.
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]

    .Taking into account overseas territories and possessions, France has the most, with at least twelve time zones, followed by Australia with ten, the United States with nine and the United Kingdom with at least eight.
  • In terms of area, China is the largest country with only one time zone (UTC+8).^ The United Kingdom has eight time zones for itself and its overseas territories.Canada has six official time zones.
    • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]

    ^ The United States is second with nine time zones, six for states and three more for possessions.
    • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

    ^ Sydney time zones, Melbourne time zones, Australia time zones.
    • Worldwide Time Zone Converter, Greenwich Mean Time GMT, Universal Coordinated Time UTC, World Time Zone Conversions 6 February 2010 13:45 UTC www.export911.com [Source type: News]

    .Before the Communist control of the mainland in 1949 during the Chinese Civil War, China was separated into five time zones.^ In terms of area, China is the largest country with only one time zone (UTC+8), although before the Chinese Civil War in 1949 China was separated into five time zones.
    • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

    ^ Before 1949 China used five time zones (see Time in China).” .

    ^ China also has the widest spanning time zone.
    • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

    .China also has the widest spanning time zone.^ China also has the widest spanning time zone.
    • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
    • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]
    • Time Zone 6 February 2010 13:45 UTC www.exactspent.com [Source type: FILTERED WITH BAYES]

    ^ Before the Communist control of the mainland in 1949 during the Chinese Civil War , China was separated into five time zones .
    • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

    ^ Before the Communist control of the mainland in 1949 during the Chinese Civil War , China was separated into five time zones.
    • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

    .See: Time in China
  • Stations in Antarctica generally keep the time of their supply bases, thus both the Amundsen-Scott South Pole Station (U.S.) and McMurdo Station (U.S.) use New Zealand time (UTC+12 southern winter, UTC+13 southern summer).
  • The 27° N latitude passes back and forth across time zones in South Asia.^ Parameters: zone - the new default time zone .
    • Java 2 Platform SE v1.3: Class TimeZone 15 September 2009 4:16 UTC www.cs.sunysb.edu [Source type: FILTERED WITH BAYES]

    ^ See: Time in China Stations in Antarctica generally keep the time of their supply bases, thus both the Amundsen-Scott South Pole Station (U.S.) and McMurdo Station (U.S.) use New Zealand time ( UTC+12 southern winter, UTC+13 southern summer).
    • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

    ^ Parameters: ID - the new time zone ID. .
    • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
    • Java 2 Platform SE v1.3: Class TimeZone 15 September 2009 4:16 UTC www.cs.sunysb.edu [Source type: FILTERED WITH BAYES]

    .Pakistan: +5, India +5:30, Nepal +5:45, India (Sikkim) +5:30, China +8:00, Bhutan +6:00, India (Arunachal Pradesh) +5:30, Myanmar +6:30. This switching was more odd in 2002, when Pakistan enabled Daylight Saving Time.^ Offset (int era, int year, int month, int day, int dayOfWeek, int milliseconds) Gets the time zone offset, for current date, modified in case of daylight savings.
    • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
    • Java 2 Platform SE v1.3: Class TimeZone 15 September 2009 4:16 UTC www.cs.sunysb.edu [Source type: FILTERED WITH BAYES]

    ^ TimeZone has a daylight savings time period, false otherwise.
    • TimeZone | Android Developers 15 September 2009 4:16 UTC dev.android.com [Source type: FILTERED WITH BAYES]

    ^ This method returns a historically correct offset if an underlying TimeZone implementation subclass supports historical Daylight Saving Time schedule and GMT offset changes.
    • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

    .Thus from west to east, time zones were: +6:00, +5:30, +5:45, +5:30, +8:00, +6:00, +5:30 and +6:30.
  • Because the earliest and latest time zones are 26 hours apart, any given calendar date exists at some point on the globe for 50 hours.^ Offset (int era, int year, int month, int day, int dayOfWeek, int milliseconds) Gets the time zone offset, for current date, modified in case of daylight savings.
    • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
    • Java 2 Platform SE v1.3: Class TimeZone 15 September 2009 4:16 UTC www.cs.sunysb.edu [Source type: FILTERED WITH BAYES]

    ^ For example, when a website maintaining a group calendar in the United States schedules a recurring meeting for 08:00 Pacific Time , it is referring to what is sometimes known as wall time (so called because that is the time shown " on the clock (or calendar) on the wall ").
    • Working with Time Zones 6 February 2010 13:45 UTC www.w3.org [Source type: Reference]

    ^ Each zone is one hour behind the zone to its east.
    • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

    .For example, April 11 begins in time zone UTC+14 at 10:00 UTC April 10, and ends in time zone UTC-12 at 12:00 UTC April 12.
  • There are numerous places where several time zones meet, for instance at the tri-country border of Finland, Norway and Russia.
  • There are about 39 time zones instead of 24 (as popularly believed).^ Sunday in April, at 2:00 local time .

    ^ UTC-12:00, no daylight saving time) .

    ^ Sunday in April, at 0:00 local time .

    .This is due to fractional hour offsets and zones with offsets larger than 12 hours near the International Date Line.^ (GMT-12:00) International Date Line West .
    • Time Zones - Cities of Earth 3D Screensaver - Screenomania.com 6 February 2010 13:45 UTC www.screenomania.com [Source type: News]

    ^ International Date Line West (UTC-12) .

    ^ This happens at the international date line.
    • Astronomy Answers: AstronomyAnswerBook: Time 6 February 2010 13:45 UTC www.astro.uu.nl [Source type: General]

    .Some micronations may use offsets that are not recognized by all authorities.
  • The largest time gap along a political border is the 3.5 hour gap along the border of China (UTC +8) and Afghanistan (UTC+4:30).
  • One of the most unusual time zones is the Australian Central Western Time zone (CWST), which is a small strip of Western Australia from the border of South Australia west to E125.5°, just before Caiguna.^ An easy to use time zone converter.
    • →    Time Zone Converters — Choose One Time Genie's Time Zone Converters 14 January 2010 14:54 UTC www.timegenie.com [Source type: News]

    ^ Knowledge of time zone offsets is required.
    • →    Time Zone Converters — Choose One Time Genie's Time Zone Converters 14 January 2010 14:54 UTC www.timegenie.com [Source type: News]

    ^ One of the most unusual time zones is the Australian Central Western Time zone (CWST), which is a small strip of Western Australia from the border of South Australia west to E125.5°, just before Caiguna .
    • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
    • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

    .It is 8¾ hours ahead of UTC (UTC+8:45) and covers an area of about 35,000 km², larger than Belgium, but has a population of about 200. Although unofficial, it is universally respected in the area--as without it, the time gap in standard time at E129° (the WA/SA border) would be 1.5 hours.^ Universal Time is the world time standard.
    • Atomic Time Zone - Frequently Asked Questions 6 February 2010 13:45 UTC amo.net [Source type: FILTERED WITH BAYES]

    ^ Time offsets from Coordinated Universal Time (UTC) .
    • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

    ^ How about Mountain Standard Time?
    • Which Time Zone? - Discussion » ChinesePod 6 February 2010 13:45 UTC chinesepod.com [Source type: General]

    See Time in Australia.

Internet and computer systems

UTC is used on the Internet for meetings (i.e. IRC chats, news, shows and so on).
The format is based in the W3C Note "datetime".
.On the other hand, most modern computer operating systems include information about time zones, including the capability to automatically change the local time when daylight saving starts and finishes (see the article on daylight saving time for more details on this aspect).^ Last Saturday in September, at 2:00 local daylight saving time .

^ First of April, at 0:00 local daylight saving time .

^ To be precise, it is about how Notes handles time zones and daylight-saving time (DST).
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

NTP

.The protocol used the most to synchronize time with multiple sources across the internet is Network Time Protocol (NTP).^ The protocol used the most to synchronize time with multiple sources across the internet is Network Time Protocol (NTP).
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ I can do multiple networks in different time zones.
  • OpenDNS Community > Idea Bank > Change the time zone for stats 6 February 2010 13:45 UTC ideabank.opendns.com [Source type: FILTERED WITH BAYES]

^ Normally a large organization has an internal server to keep time with one of the public NTP servers on the internet, and then this server acts as a proxy and becomes the official timekeeper for all organization machines.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

.It operates across multiple platforms and there are a wide array of public servers available on the internet to synchronize with.^ It operates across multiple platforms and there are a wide array of public servers available on the internet to synchronize with.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ Normally a large organization has an internal server to keep time with one of the public NTP servers on the internet, and then this server acts as a proxy and becomes the official timekeeper for all organization machines.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ TimeSync synchronizes your computer clock with an internet time server which have very accurate clocks, generally synchronized by the harmonics of an atom.
  • Time Zone Downloads - Time Zone Helper (DataMystic), Time Zone Calculator (Evercyber), ... 6 February 2010 13:45 UTC www.fileheap.com [Source type: General]

.Every server is normally kept updated with an atomic clock belonging to the standards institution of each country.^ Synchronizing time with atomic clock servers.
  • Time zones downloads at VicMan 6 February 2010 13:45 UTC www.vicman.net [Source type: General]

^ Every server is normally kept updated with an atomic clock belonging to the standards institution of each country.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ All Versions of Atomic Time Zone contain a Server File, which can be easily updated or edited.
  • Atomic Time Zone - Frequently Asked Questions 6 February 2010 13:45 UTC amo.net [Source type: FILTERED WITH BAYES]

.Normally a large organization has an internal server to keep time with one of the public NTP servers on the internet, and then this server acts as a proxy and becomes the official timekeeper for all organization machines.^ Internet time server .
  • Aaron Margosis' "Non-Admin" and App-Compat WebLog : Changing the system date, time and/or time zone 6 February 2010 13:45 UTC blogs.msdn.com [Source type: FILTERED WITH BAYES]

^ Normally a large organization has an internal server to keep time with one of the public NTP servers on the internet, and then this server acts as a proxy and becomes the official timekeeper for all organization machines.
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ Australia has nine time zones (one unofficial and three official on the mainland plus four for its territories and one more for an Antarctic station not included in other time zones).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

.NTP is so popular now that virtually all IP-capable devices implement some degree of NTP client software.^ NTP is so popular now that virtually all IP -capable devices implement some degree of NTP client software.
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ Freeney, a perennial All-Pro, has now not practiced since suffering a third degree low ankle sprain in the AFC championship game.
  • New Orleans Saints Football NFL News - NOLA.com 6 February 2010 13:45 UTC www.nola.com [Source type: General]

^ Device Reviews Software Reviews BlackBerry Cases Bluetooth Headsets General Accessories Community Reviews See All Reviews...
  • Explanation: BB's Implementation of Time Zones - BlackBerry Forums at CrackBerry.com 6 February 2010 13:45 UTC forums.crackberry.com [Source type: General]

Unix

Main article: Unix time
.Most Unix-like systems, including Linux and Mac OS X, keep system time as UTC (Coordinated Universal Time).^ The dates and times for these files are listed in Coordinated Universal Time (UTC).
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]
  • 2007 time zone update for Windows XP and Windows Server 2003 14 January 2010 14:54 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Nowadays, much of the world says "UTC" ( Coordinated Universal Time ).
  • Which Time Zone? - Discussion » ChinesePod 6 February 2010 13:45 UTC chinesepod.com [Source type: General]

^ Time offsets from Coordinated Universal Time (UTC) .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.Rather than having a single timezone set for the whole computer, timezone offsets can vary for different processes.^ Rather than having a single timezone set for the whole computer, timezone offsets can vary for different processes.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Also do you know how to show a more resticted set of TimeZones (1 entry per offset) rather than one for each country and region, e.g.
  • mad.ly – Rails 2.1 Time Zone Support: An Overview 6 February 2010 13:45 UTC mad.ly [Source type: General]

^ Rather than a voice menu to select a location, the menu prompts for the local clock time and computes the time-zone offset from the time in London.
  • Time-Zone Processing with Asterisk, Part I 6 February 2010 13:45 UTC www.linuxjournal.com [Source type: General]

.Standard library routines are used to calculate the local time based on the current timezone, normally supplied to processes through the TZ environment variable.^ GregorianCalendar ( TimeZone  zone) Constructs a GregorianCalendar based on the current time in the given time zone with the default locale.
  • GregorianCalendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ The milliseconds in day in standard local time.
  • SimpleTimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • SimpleTimeZone (Java 2 Platform SE 5.0) 6 February 2010 13:45 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ Standard library routines are used to calculate the local time based on the current timezone, normally supplied to processes through the TZ environment variable .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.This allows users in multiple timezones to use the same computer, with their respective local times displayed correctly to each user.^ This allows users in multiple timezones to use the same computer, with their respective local times displayed correctly to each user.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ However, their use is deprecated because the same abbreviation is often used for multiple time zones (for example, "CST" could be U.S. "Central Standard Time" and "China Standard Time"), and the Java platform can then only recognize one of them.
  • TimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • TimeZone | Android Developers 15 September 2009 4:16 UTC dev.android.com [Source type: FILTERED WITH BAYES]

^ Time zones are thus a compromise, relaxing the complex geographic dependence while still allowing local time to approximate the mean solar time.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

.Timezone information is most commonly stored in a timezone database known as zoneinfo (or sometimes tz or Olson format).^ Timezone information is most commonly stored in a timezone database known as zoneinfo (or sometimes tz or Olson format).
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ EclipseLink does not store the timezone in the database by default.
  • Nabble - EclipseLink - Users - MySQL's datetime and time-zones? 6 February 2010 13:45 UTC old.nabble.com [Source type: FILTERED WITH BAYES]

^ ORACLE_HOME/oracore/zoneinfo/readme.txt for detailed information about time zone file updates Oracle Database Upgrade Guide for upgrade information .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.In fact, many systems, including anything using the GNU C Library, can make use of this database.^ In fact, many systems, including anything using the GNU C Library , can make use of this database.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ Often called tz or zoneinfo , this database is used by several implementations, including the GNU C library used by many Unix variants.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ Returns the system date, including fractional seconds and time zone of the system on which the database resides .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

Microsoft Windows

.Windows based computer systems normally keep system time as local time in a particular time zone.^ Windows based computer systems normally keep system time as local time in a particular time zone.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ Operating system local time zone ( ' OS_TZ' ) .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Changing the system date, time and/or time zone .
  • Aaron Margosis' "Non-Admin" and App-Compat WebLog : Changing the system date, time and/or time zone 6 February 2010 13:45 UTC blogs.msdn.com [Source type: FILTERED WITH BAYES]

.A system database of timezone information includes the offset from UTC and rules that indicate the start and end dates for daylight saving in each zone.^ The tz database - Provides specific information on the beginning and ending dates of daylight saving time for each zone and tracks time zones over the years.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]
  • Time zone - Calendar Wiki 6 February 2010 13:45 UTC calendars.wikia.com [Source type: FILTERED WITH BAYES]

^ Month - The daylight saving time starting month.
  • SimpleTimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • SimpleTimeZone (Java 2 Platform SE 5.0) 6 February 2010 13:45 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ DST End date rule See DST Start date rule.
  • Local Time 14 January 2010 14:54 UTC www.boost.org [Source type: FILTERED WITH BAYES]

.Application software is able to calculate the time in various zones, but there is no standard way for users from multiple zones to use a single server and have their own local time presented to them.^ The milliseconds in day in standard local time.
  • SimpleTimeZone (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]
  • SimpleTimeZone (Java 2 Platform SE 5.0) 6 February 2010 13:45 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ Time Zone Calculator 1.2 download by Evercyber .
  • Time Zone Downloads - Time Zone Helper (DataMystic), Time Zone Calculator (Evercyber), ... 6 February 2010 13:45 UTC www.fileheap.com [Source type: General]
  • Time Zones Downloads - Time Zone Calculator (Evercyber), WorldTime (NanoCode Software), ... 6 February 2010 13:45 UTC www.fileheap.com [Source type: General]

^ What are the different ways I can use Atomic Time Zone?
  • Atomic Time Zone - Frequently Asked Questions 6 February 2010 13:45 UTC amo.net [Source type: FILTERED WITH BAYES]

Smalltalk

.Each Smalltalk dialect comes with its own built-in classes for dates, times and timestamps, only a few of which implement the DateAndTime and Duration classes as specified by the ANSI Smalltalk Standard.^ Each Smalltalk dialect comes with its own built-in classes for dates, times and timestamps, only a few of which implement the DateAndTime and Duration classes as specified by the ANSI Smalltalk Standard.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ DaylightTime ( Date time) Returns whether the specified Date is in the daylight savings time period for this TimeZone .
  • TimeZone | Android Developers 15 September 2009 4:16 UTC dev.android.com [Source type: FILTERED WITH BAYES]

^ DisplayName ( Locale locale) Gets the LONG name for this TimeZone for the specified Locale in standard time.
  • TimeZone | Android Developers 15 September 2009 4:16 UTC dev.android.com [Source type: FILTERED WITH BAYES]

.VisualWorks provides a TimeZone class that supports up to 2 annually-recurring offset transitions, which are assumed to apply to all years (same behavior as Windows time zones.^ Time zone support in Notes 4.x .
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ TimeZone getTimeZone () Gets the time zone.
  • Calendar (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

^ Default ( TimeZone timezone) Sets the default time zone.
  • TimeZone | Android Developers 15 September 2009 4:16 UTC dev.android.com [Source type: FILTERED WITH BAYES]

) .Squeak provides a Timezone class that does not support any offset transitions.^ Squeak provides a Timezone class that does not support any offset transitions.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ VisualWorks provides a TimeZone class that supports up to 2 annually-recurring offset transitions, which are assumed to apply to all years (same behavior as Windows time zones.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ This method returns a historically correct offset if an underlying TimeZone implementation subclass supports historical Daylight Saving Time schedule and GMT offset changes.
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.Dolphin Smalltalk does not support time zones at all.^ Time zone support in Notes 4.x .
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ Dolphin Smalltalk does not support time zones at all.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ So, you can get a U.S. Pacific Time TimeZone object with: TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles"); You can use the getAvailableIDs method to iterate through all the supported time zone IDs.
  • TimeZone (Java Platform SE 6) 15 September 2009 4:16 UTC java.sun.com [Source type: FILTERED WITH BAYES]

.For full support of the Olson Time Zone Database (zoneinfo) in a Smalltalk application (including support for any number of annually-recurring offset transitions, and support for different intra-year offset transition rules in different years) the third-party, open-source, ANSI-Smalltalk-compliant Chronos Date/Time Library is available for use with any of the following Smalltalk dialects: VisualWorks, Squeak or Dolphin.^ Time zone support in Notes 4.x .
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ By the looks of it EclipseLink stores the date using > > > the current time-zone.
  • Nabble - EclipseLink - Users - MySQL's datetime and time-zones? 6 February 2010 13:45 UTC old.nabble.com [Source type: FILTERED WITH BAYES]

^ Database time zone ( dbtimezone ) .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

Java

.While most application software will use the underlying operating system for timezone information, Java language, from version 1.3.1, has maintained its own timezone database.^ As long as your Location document is set to "Use operating system's timezone settings," you don't have to fuss with Notes time zone settings at all.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

^ If the definition matches, the tool can rewrite the appointment by using the "new version" of the time zone information.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Notes R5 checks the time zone and daylight-saving time settings in the operating system and uses them.
  • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

.This database (as well as the operating system database) will need to be updated whenever timezone rules change.^ The operating system is not updated to accommodate the new time zone rules.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ The operating system is updated for new DST rules.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

^ Keep in mind that the client might not be as smart as you need it to be — not all operating systems keep historical time zone information, and for those that do, not all users have kept this information up-to-date, via service pack updates etc.
  • mad.ly – Rails 2.1 Time Zone Support: An Overview 6 February 2010 13:45 UTC mad.ly [Source type: General]

.One unfortunate problem is that the date of the start of daylight saving time was altered by the New South Wales government for year 2000 to accommodate the 2000 Summer Olympics.^ Arizona doesn't have daylight savings time.

^ Transition times for Daylight Saving Time .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

.This altered date was included with the Sun Java Virtual Machine.^ Default ( Locale  newLocale) Sets the default locale for this instance of the Java Virtual Machine.
  • Locale (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

^ The Java Virtual Machine sets the default locale during startup based on the host environment.
  • Locale (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

^ Locale getDefault () Gets the current value of the default locale for this instance of the Java Virtual Machine.
  • Locale (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

Python

.The standard module datetime stores and operates on the timezone information class tzinfo.^ The standard module datetime stores and operates on the timezone information class tzinfo .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Timezone information is most commonly stored in a timezone database known as zoneinfo (or sometimes tz or Olson format).
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Oracle Database SQL Reference for detailed information about datetime and interval arithmetic operations .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

.The third party pytz module provides access to the full zoneinfo database.^ The third party pytz module provides access to the full zoneinfo database.
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

Databases

.Some databases allow storage of a datetime type having time zone information.^ MySQL's datetime and time-zones?
  • Nabble - EclipseLink - Users - MySQL's datetime and time-zones? 6 February 2010 13:45 UTC old.nabble.com [Source type: FILTERED WITH BAYES]

^ Oracle Database uses two data types to store time zone information: .
  • Time zone - Familypedia 6 February 2010 13:45 UTC familypedia.wikia.com [Source type: FILTERED WITH BAYES]

^ Returns the value of the database time zone.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

The SQL standard defines two standard time data types:
TIMESTAMP WITH TIME ZONE
TIMESTAMP WITHOUT TIME ZONE
.However the standard has a somewhat naive understanding of time zones.^ (However, "+0000" does not have to be in GMT, as other time zones could have the same UTC offset .
  • Time zones, time zone symbols, time zone information 6 February 2010 13:45 UTC www.artistrelations.com [Source type: News]

^ Not everyone understands exactly how time or time zones are determined.
  • →    Understanding Time Zones — Fascinating Time Zones 6 February 2010 13:45 UTC www.timegenie.com [Source type: News]

^ (However, "-0800" does not have to be in AKDT, as other time zones could have the same UTC offset).
  • Time zones, time zone symbols, time zone information 6 February 2010 13:45 UTC www.artistrelations.com [Source type: News]

.It generally assumes a time zone can be specified by a simple offset from GMT. This causes problems when trying to do arithmetic on dates which span daylight savings time transitions or which span political changes in time zone rules.^ UTC+11:30, no daylight saving time rule) .

^ "D" if daylight saving time applies.

^ Time zones are divided into standard and daylight saving (or summer).
  • International time zones, US time zones, world clock 6 February 2010 13:45 UTC www.timezonedistance.com [Source type: News]
  • International time zones, world time clock, world time zones, GMT / UTC / DST 6 February 2010 13:45 UTC www.happyzebra.com [Source type: News]

Oracle

.Oracle Database is configured with a database time zone, and connecting clients are configured with session time zones.^ Returns the value of the database time zone.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ It normalizes the data to the database time zone every time the data is sent to and from a client.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Database time zone ( dbtimezone ) .
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

Oracle Database uses two data types to store time zone information:
TIMESTAMP WITH TIME ZONE 
Stores date and time information with the offset from UTC
TIMESTAMP WITH LOCAL TIME ZONE 
Stores date and time information with respect to the dbtimezone (which cannot be changed so long as there is a column in the db of this type), automatically adjusting the date and time from the stored time zone to the client's session time zone.

PostgreSQL

.PostgreSQL uses the standard SQL data types but tries to impose an interpretation which avoids the problems described above.^ Applied Technologies Group Home  >   Navigation  >   Data Type Catalogue Project Version 3.0  >   CDT Catalogue  >   Time Zone Code Standard .

TIMESTAMP WITH TIME ZONE 
Stores date and time in UTC and converts to the client's local time zone (which could be different for each client) for display purposes.
TIMESTAMP WITHOUT TIME ZONE 
Stores date and time without any conversion on input or output.

References

  1. ^ Bristol Time
  2. ^ Template:Pdflink
  3. ^ Doug O'Hara ({{subst:#ifexist:2007-03-11|[[2007-03-11|]]|[[Wikipedia:2007-03-11|]]}}). Alaska: daylight stealing time. Far North Science. Retrieved on 2007-05-11.
  • Bowditch, Nathaniel. American Practical Navigator. Washington: Government Printing Office, 1925, 1939, 1975.
  • Hill, John C., Thomas F. Utegaard, Gerard Riordan. Dutton's Navigation and Piloting. Annapolis: United States Naval Institute, 1958.
  • Howse, Derek. .Greenwich Time and the Discovery of the Longitude.^ The prime meridian, corresponding to longitude 0° and passing through Greenwich, England, is the center of time zone zero.
    • Eyes on the Sky, Feet on the Ground: Chapter Three 6 February 2010 13:45 UTC hea-www.harvard.edu [Source type: FILTERED WITH BAYES]

    Oxford: Oxford University Press, 1980. ISBN 0-19-215948-8.
  • Palin, Michael. Pole to Pole. Bay Books, 1995. ISBN 0-912333-41-3.

See also

External links

.
  • [1] AGlobalWorld.com provides current time in many cities/zones.
  • The tz database - Provides specific information on the beginning and ending dates of daylight saving time for each zone and tracks time zones over the years.^ The real monkey wrench in time zone conversions is daylight-saving time.
    • Keeping Time: How Notes handles time zones and daylight-saving time 6 February 2010 13:45 UTC www.ibm.com [Source type: FILTERED WITH BAYES]

    ^ By the looks of it EclipseLink stores the date using > > > the current time-zone.
    • Nabble - EclipseLink - Users - MySQL's datetime and time-zones? 6 February 2010 13:45 UTC old.nabble.com [Source type: FILTERED WITH BAYES]

    ^ "D" if daylight saving time applies.

    Often called tz or zoneinfo, this database is used by several implementations, including the GNU C library used by many Unix variants.
  • US Official Time Clock - Java enabled clock to graphically display night and day around the globe.
  • Date and Time Gateway - Get current time in major cities
  • W3C Note Datetime.
  • WorldtimeZone Map with current time in certain cities/zones.
  • World clock and time zones.
<span class="FA" id="genealogy_wikia_uk" style="display:none;" />

.This page uses content from the English language Wikipedia.^ Locale ENGLISH Useful constant for language.
  • Locale (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

^ ENGLISH           Useful constant for language.
  • Locale (Java 2 Platform SE v1.4.2) 15 September 2009 4:16 UTC java.sun.com [Source type: Reference]

.The original content was at Time zone.^ ISO [ "_" regional_code [ "_" variant] ] The geographical time zone identifier is derived from the offset to UTC. Origin for UTC is the Zero Meridian going through Greenwich.

^ The three-hour difference is preserved, but the time zone/region of the original transaction is not.
  • Datetime Datatypes and Time Zone Support 6 February 2010 13:45 UTC download-east.oracle.com [Source type: FILTERED WITH BAYES]
  • Datetime Datatypes and Time Zone Support 14 January 2010 14:54 UTC download.oracle.com [Source type: FILTERED WITH BAYES]

^ Added a new "Using the /Quiet option in a time zone move operation" section and a new "Specifying the Original and New Time zone for a time zone move operation" section.
  • How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook 6 February 2010 13:45 UTC support.microsoft.com [Source type: FILTERED WITH BAYES]

The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.
Facts about Time zoneRDF feed

This article uses material from the "Time zone" article on the Genealogy wiki at Wikia and is licensed under the Creative Commons Attribution-Share Alike License.

Simple English

File:Timezones
Standard Time Zones of the World as of 2005. (Some time zones have changed since then)

Time zones give specific areas on the Earth a time of day that is earlier or later than the neighboring time zones. This is because when it is day-time on one side of the Earth, it is night-time on the other side. There are 39 time zones dividing the Earth into different times, each with its own name, like the North American Eastern Time Zone. The North American Eastern Time Zone contains large cities in North America like New York City and Miami.

Greenwich Mean Time is the time in London, and is often used for things that involve more than one time zone.

Rapid travel across several time zones often causes Jet Lag, a disorder of the circadian rhythms causing disturbed sleep and mood.

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