During Daylight Saving Time, which begins in the spring, clocks are turned forward an hour, shifting an hour of light from the morning to the evening. When Daylight Saving Time ends in the fall, clocks are set back an hour and Standard Time resumes.
According to the present schedule—determined by the Energy Policy Act of 2005—the United States springs forward at 2:00 a.m. on the second Sunday in March, and falls back at 2:00 a.m. on the first Sunday in November.
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