Turn Clocks Ahead -- March 9

[USA.gov]

Remember to set your clocks forward one hour on Sunday, March 9. The transition officially happens at 2:00 a.m. local standard time, which becomes 3:00 a.m. local daylight time. The majority of the United States observes daylight time, but there are some exceptions, including Hawaii and most of Arizona. Many other countries observe some change in time, but it’s not necessarily in sync with America’s schedule.

Visit USA.gov: The U.S. Government's Official Web Portal for additional information about daylight saving time.

• In 2006, daylight time begins on April 2 and ends on October 29.
• In 2007, daylight time begins on March 11 and ends on November 4. [New law goes into effect.]
• 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.

Many other countries observe some form of "summer time", but they do not necessarily change their clocks on the same dates as the U.S.

Daylight time and time zones in the U.S. are defined in the U.S. Code, Title 15, Chapter 6, Subchapter IX - Standard Time.