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Year 2007 problem: Wikis


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From Wikipedia, the free encyclopedia

The Year 2007 problem also known as Y2K7 (or DST07) is an issue caused by the U.S. Energy Policy Act of 2005, which changed the dates for daylight saving time in the United States, and other national or regional legislation. The change had repercussions in the computer industry.[1] Starting in 2007, daylight saving time in many jurisdictions of the United States and Canada began earlier each year and ran later each fall than in previous years; in 2007, for instance, it started on the second Sunday in March and ended on the first Sunday in November.[1]

Any device that automatically corrected its clock to match the time changes to daylight saving time, such as personal computers and VCRs, needed to be updated so that the device would know of the new rules.[1] If the devices weren't updated, they showed an incorrect time for three weeks in March and one week in November, causing a number of problems, including having e-mail with wrong timestamps; events in calendaring software used on PDAs and other computers being displayed incorrectly, set for the wrong time, or syncing between devices that are aware of the changes in DST and those that aren't (e.g. between an updated BlackBerry or Palm device and a computer either of which required their own updates); and some authentication software, such as Kerberos in Mac OS, not behaving properly.[1] To avoid these problems, users either have to update their devices manually when daylight saving time changes, or update their software to newer versions.


Countries affected

Implications of the changes in daylight saving time extended beyond the United States as neighbouring countries had to decide if they would change their DST rules to remain in step with the United States.


Areas changed in 2007[2]

  • Canada (except most of Saskatchewan, and a few isolated areas; also, Newfoundland switches at 00:01 rather than 02:00 local time)
  • Cuba (switches at 00:00 local time)
  • New Zealand extended daylight saving times starting in the last Sunday in September (instead of the first Sunday in October)
  • Argentina introduced daylight saving time in 2007 for most but not all of the country.

Medical equipment

Some medical devices and hospital equipment may generate adverse events because of the changes. These could harm patients and not be obvious to clinicians responsible for care. The U.S. Food and Drug Administration (FDA) published a preliminary public health notification on the subject.[5]

See also


External links


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