Year 2007 problem
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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.
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[edit] 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.
[edit] Areas changed in 2007[2]
- United States (Not observed in Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands and the state of Arizona [except the Navajo Nation, which observes daylight saving time due to its large size and location in three states.])[3] Note especially that most of the state of Indiana did not observe daylight saving time until 2006, when most of the state adopted Eastern Standard Time.[4]
- 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.
[edit] 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]
[edit] See also
[edit] References
- ^ a b c d Laurence, Andrew (2007-01-29). "Daylight Saving Time May Bite the Out-of-Date". tidbits.com. http://db.tidbits.com/article/8832. Retrieved 2007-03-01.
- ^ Time change and DST (Daylight Saving Time) News
- ^ Daylight Saving Time USA — United States of America from 2007
- ^ Indiana and DST
- ^ FDA Preliminary Public Health Notification: Unpredictable Events in Medical Equipment due to New Daylight Saving Time Change
[edit] External links
- Extended Daylight Saving Time Review and Considerations A Review of the Potential Impact of Daylight Saving Time Changes in 2007 — A Reference for Users and Systems Administrators, Calendaring and Scheduling Consortium for 2007
- Change in Daylight Saving Time Effective 2007 by Mary Salvas on last edited 28 February 2007
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