US Time Zone Map

 

 

United States Time Zones

Daylight time begins in the United States on the second Sunday in March and ends on the first Sunday in November.

On the second Sunday in March, clocks are set ahead one hour at 2:00 a.m. local standard time, which becomes 3:00 a.m. local daylight time. On the first Sunday in November, clocks are set back one hour at 2:00 a.m. local daylight time, which becomes 1:00 a.m. local standard time.

Not all places in the U.S. observe daylight time (such as Arizona and Hawaii).

In 2009, daylight time begins on March 8 and ends on November 1.

In 2010, daylight time begins on March 14 and ends on November 7.

Many other countries observe some form of "summer time", but they do not necessarily change their clocks on the same dates as the U.S.