Daylight Saving Time 2013 will start March 10, 2013.
Set your clocks ahead at 2 a.m. March 10, and get ready for some extra daylight.
Daylight Saving Time Fun Facts: Arizona, Hawaii, the U.S. Virgin Islands, Puerto Rico and American Samoa do not recognize Daylight Saving Time.
According to the The National Institute of Standards and Technology:
Daylight Saving Time, or DST, is the period of the year when clocks are moved one hour ahead. In the United States, this has the effect of creating more sunlit hours in the evening during months when the weather is the warmest. We advance our clocks ahead one hour at the beginning of DST, and move them back one hour ("spring forward, fall back") when we return to Standard Time (ST). The transition from ST to DST has the effect of moving one hour of daylight from the morning to the evening. The transition from DST to ST effectively moves one hour of daylight from the evening to the morning.