For most Americans, daylight saving time 2011 starts at 2 a.m. on Sunday, March 13, when most states spring forward an hour. Time will fall back to standard time again on Sunday, November 6, 2011, when daylight saving time ends.
The federal government doesn't require U.S. states or territories to observe daylight saving time, which is why residents of Arizona, Hawaii, Puerto Rico, the Virgin Islands, American Samoa, Guam, and the Northern Marianas Islands won't need to change their clocks this weekend.
Where it is observed, daylight savings has been known to cause some problems.
National surveys by Rasmussen Reports, for example, show that 83 percent of respondents knew when to move their clocks ahead in spring 2010. Twenty-seven percent, though, admitted they'd been an hour early or late at least once in their lives because they hadn't changed their clocks correctly.
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