daylight savings time

Established by the Energy Policy Act of 2005, Pub. L. no. 109-58, 119 Stat 594 (2005)...

In the United States of America the state of Hawaii, and most of Arizona, do not use it.

Daylight (savings) time begins on the second Sunday in March (and ends on the first Sunday in November).

On the second Sunday in March, at 2:00 a.m. local standard time, clocks are set ahead one hour. (On the first Sunday in November, at 2:00 a.m. local daylight time, clocks are set back one hour.)

* In 2008, daylight time begins on March 9 and ends on November 2.
* In 2009, daylight time begins on March 8 and ends on November 1.

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Preparing for daylight saving time changes in 2008
http://support.microsoft.com/gp/dst_topissues

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(Microsoft) Daylight Saving Time Help and Support Center

Unless certain updates are applied to your computer, the time zone settings for your computer's system clock may be incorrect during this four-week period. In particular, you must make sure that both your Windows operating system and your calendar programs are updated.

...If you want to confirm, follow the steps in the Daylight Saving Time Update Guide...

...The Daylight Saving Time Update Guide...will quickly lead you to KB articles and downloads for the products you specify in the guide.