The United States daylight-saving time begins at 2 a.m. Sunday. It's all about decreasing the time from sunset to when people retire for the evening, therefore reducing domestic energy consumption. Daylight saving time runs through November 1.
Most of the nation will set clocks forward by one hour at 2 a.m. local time, which becomes 3 a.m. local daylight time. Hawaii and most of Arizona are among places that do not use daylight time .
The Energy Policy Act of 2005 extended the period for daylight time, moving the start to the second Sunday in March and the end to the first Sunday in November. Until 2007, daylight-saving time began the first Sunday of April and ended on the last Sunday of October
This year marks the third time that daylight saving time has been lengthened. In 2005, Congress increased the length of time the country is on daylight saving time by four weeks in an effort to conserve energy.
The Naval Observatory's Master Clock is the official time source for the U.S. Defense Department.
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