Dayligth Savings Time (U.S.A.) begins March 10 - 2 a.m.; continues to Sunday Nov. 3, 2013

ASSOCIATED PRESS explanatory story (Weekend of March 9 - 10):
At 2 a.m. local time Sunday (March 10, 2013), daylight saving time arrives with the promise of many months ahead with an extra hour of evening sunlight.
You lose an hour of sleep, but make sure to turn the clock ahead — spring forward — before heading to bed Saturday night (March 9, 2013) to avoid the panic of a late rise.
It’s also a good time to put new batteries in warning devices such as smoke detectors and hazard warning radios.
Some places don’t observe daylight saving time. Those include Hawaii, most of Arizona, Puerto Rico, the Virgin Islands, American Samoa, Guam and the Northern Marianas.
Daylight saving time ends November 3, 2013.

http://www.washingtonpost.com/politics/a-sure-sign-of-spring-lose-an-hour-of-sleep-gain-an-hour-of-sun-for-daylight-saving-time/2013/03/09/5c42af00-8895-11e2-b412-2e8596e7c927_story.html?hpid=z3