Daylight saving time (DST; also summer time in British English is the practice of advancing clocks so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn. Modern DST was first proposed in 1895 by George Vernon Hudson, a New Zealand entomologist. Many countries have used it since then and change occasionally.
Most of the United States begins Daylight Saving Time at 2:00 am on the second Sunday in March (March 14, 2010) and reverts to standard time on the first Sunday in November. This provides more usable hours of daylight for activities that occur in the afternoon and evening, such as outdoor recreation. Daylight saving time can also be a means of conserving electrical and other forms of energy. In the fall, as the period of daylight grows shorter, clocks are set back to correspond.
Source: http://en.wikipedia.org/wiki/Daylight_saving_time
http://www.infoplease.com/spot/daylight1.html History
http://www.enchantedlearning.com/inventors/page/f/franklin.shtml DST suggested by Ben Franklin
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