When does Daylight Saving Time/Standard Time begin?

Daylight Saving Time begins each year at 2 a.m. on the first Sunday of April. Move clocks ahead one hour at the start of Daylight Saving Time.

Standard Time begins each year at 2 a.m. on the last Sunday of October. Move your clocks back one hour at the resumption of Standard Time. Daylight Saving time and Time zones are regulated by the U.S. Department of Transportation, not by NIST.

NIST's Time and Frequency Division, FAQs page

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