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An hour shift which is seasonally inserted in some (but not all) time zones. Daylight saving
time is in effect during summer, and is usually one hour ahead of standard time. In those portions of the
United States which observe daylight saving time, it is in effect from the first Sunday in April to the last Sunday of
October. Daylight savings time begins when clocks are set from 2:00 a.m. to 3:00 a.m. on the first Sunday in April
and ends when clocks are set from 3:00 a.m. to 2:00 a.m. on last Sunday in October.
| year |
daylight saving time starts |
daylight saving time ends |
| 1998 |
Apr 5 |
Oct 25 |
| 1999 |
Apr 4 |
Oct 31 |
| 2000 |
Apr 2 |
Oct 29 |
| 2001 |
Apr 1 |
Oct 28 |
| 2002 |
Apr 7 |
Oct 27 |
| 2003 |
Apr 6 |
Oct 26 |
| 2004 |
Apr 4 |
Oct 31 |
| 2005 |
Apr 3 |
Oct 30 |
In the United States, the only states which do not use daylight saving time are Hawaii, Arizona, and most of
Indiana. Since U.S. Eastern Standard Time (EST) is UT-5 hours, U.S. Eastern Daylight Time (EDT) is UT-4 hours.
 Standard Time, Time, Time Zone
© 1996-2007 Eric W. Weisstein
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