When does Daylight Saving Time/Standard Time begin?

2007 and beyond

 The U.S. Energy Policy Act of 2005 mandates that Daylight Saving Time
 (DST) in the United States of America 
 	start on the second Sunday in March
 and 
 	end on the first Sunday in November 
 starting in 2007. 

Before 2007

 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.