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Map Time Zones USA

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Time Zones & DST USA

There are 4 time zones in the continental USA... and 2 zones outside

Daylight Saving Time (DST) in the USA

DST 2010: Sunday, March 14 until Sunday, November 7, 2010
DST (=turn clock 1 hr ahead) will begin at 2 a.m. on the second Sunday in March
and Standard Time (=turn clock 1 hr back) will begin at 2 a.m. on the first Sunday in November.

Last change
On August 8, 2005, President Bush signed the Energy Policy Act of 2005, which included changes in Daylight Saving Time, effective March 1, 2007.

Source: Physics Laboratory, U.S. National Institute of Standards & Technology

U.S. Data & Facts