United States Time Zones
Daylight time begins
in the United States on the first Sunday in April and ends on the last Sunday in
October.
On the first Sunday
in April, 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 last Sunday
in October, clocks are set back one hour at 2:00 a.m. local daylight time, which
becomes 1:00 a.m. local standard time.
Starting in March 2007, daylight time in the United States will begin on the second Sunday in March and end on the firstSunday in November.
Not all places in
the U.S. observe daylight time (such as Arizona and Hawaii).
In 2007, daylight time begins on March 11 and ends on November 4.
In 2008, daylight time begins on March 9 and ends on November 2.
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.
