Daylight saving time (DST; also summer time in British English) is the convention 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 1907 by the English builder William Willett.
Adding daylight to afternoons benefits retailing, sports, and other activities that exploit sunlight after working hours, but causes problems for farming, entertainment and other occupations tied to the sun. Traffic fatalities are reduced when there is extra afternoon daylight; its effect on health and crime is less clear. Although an early goal of DST was to reduce evening usage of incandescent lighting, formerly a primary use of electricity, modern heating and cooling usage patterns greatly differ, and research about how DST currently affects energy use is limited and often contradictory.
In U.S.A., the day light saving begins on the 2nd Sunday of March and ends on the 1st Sunday of November. The time would be 3:00 am on March 2nd instead of 2:00 am, which means you have lost an hour of your life in the lighter vein...
Source:: WIKI
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