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Mountain Standard Time (MST) is UTC−7 (represented in the green area slightly left from center)

The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time, sometimes called Greenwich Mean Time (UTC−7) during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time in the spring, summer, and early autumn (UTC−6). The clock time in this zone is based on the mean solar time of the 105th meridian west of the Greenwich Observatory.

In the United States and Canada, this time zone is generically called Mountain Time (MT). Specifically, it is Mountain Standard Time (MST) when observing standard time (Winter), and Mountain Daylight Time (MDT) when observing daylight saving time. In Mexico this time is known as the Pacific Zone. In the USA, the exact specification for the location of time zones and the dividing line between zones is set forth in the Code of Federal Regulations at 49 CFR 71.[1]

The zone is one hour ahead of the Pacific Time Zone and one hour behind the Central Time Zone.

In some areas, starting in 2007, the local time changes from MST to MDT at 02:00 LST to 03:00 LDT on the second Sunday in March and returns at 02:00 LDT to 01:00 LST on the first Sunday in November.

Most of Arizona does not observe daylight saving time, and during summer months is on the same time as Pacific Daylight Time, though it is still called Mountain Standard Time in Arizona. The Navajo Nation, most of which lies within Arizona, does observe daylight saving time, although the Hopi Nation (as well as some Arizona state offices) lying within the Navajo Nation do not.

The largest city in the Mountain Time Zone is Phoenix, Arizona.

TV broadcasting in the Mountain Time Zone is typically tape-delayed one hour, so that shows match the broadcast times of the Central Time Zone (i.e. prime time begins at 7:00 p.m. MT following the same order of programming as the other two time zones).

Contents

Canada

The following provinces and areas are part of the Mountain Time Zone:

Mexico

The following states are part of the Mountain Time Zone:

United States

The following states or areas are part of the Mountain Time Zone:

Arizona does not observe daylight saving time. However, the Navajo Nation, the bulk of whose area is within Arizona, observes daylight saving time throughout its territory. The Hopi Reservation, an enclave inside the Navajo Nation, does not observe daylight saving time.

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Tz database

See also: List of tz database time zones
US  +394421−1045903 America/Denver Colorado
US  +433649−1161209 America/Boise    south Idaho & east Oregon
US  +364708−1084111 America/Shiprock Navajo
US  +332654−1120424 America/Phoenix  Arizona

Major metropolitan areas

*- Largest city in time zone

References

  1. ^ The specification for the Mountain Time Zone in the United States is set forth at 49 CFR 71.8, and is listed in text and pdf formats.
    The boundary between Central and Mountain is set forth at 49 CFR 71.7, and is listed in text and pdf formats.
    The boundary between Mountain and Pacific is set forth at 49 CFR 71.9, and is listed in text and pdf formats.

Sources


Simple English

The Mountain Time Zone subtracts seven hours from UTC during standard time (UTC-7) and six hours during daylight saving time (UTC-6).

This time zone is called Mountain Standard Time (MST) during standard time (Winter). It is called Mountain Daylight Time (MDT) during daylight saving time (Summer). In the United States and Canada, this time zone is often just called Mountain Time (MT).

The zone is one hour ahead of the Pacific Time Zone and one hour behind the Central Time Zone.

Contents

Places that are in Mountain Time Zone

Canada

In Canada, this time zone includes all of Alberta, the Northwest Territories (except for Tungsten), the Kitikmeot Region of Nunavut, part of southeastern and northeastern British Columbia, and the area of Saskatchewan around the city of Lloydminster.

United States

In the United States, the time zone includes the entire area of the states of California], New Mexico, Wyoming, Utah, Colorado, and Montana. It also includes parts of Idaho, Oregon, North Dakota, South Dakota, Nebraska, Texas, Kansas, and Nevada.

Mexico

These states are part of the Mountain Time Zone: Baja California Sur, Chihuahua, Nayarit, Sinaloa, Sonora.

Mountain Daylight Time

Daylight saving time occurs from early April to late October. During daylight saving, Central Time Zone is only 6 hours behind Coordinated Universal Time (UTC-6). Most of the locations in Mountain Time Zone observe daylight saving time. A few places do not. These include Sonora and all of Arizona that is not in the Navajo Nation. These places stay on standard time all year.

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