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[IP] What are the U.S. time zones?
Sheesh, can't believe what a controversy this has become: (not that all
chatters are from the U.S. either)
Standard time in the U.S. and its territories is observed within eight time
zones. Standard time within each time zone is an integral number of hours
offset from a time scale called Universal Time, Coordinated (abbreviated
UTC), maintained by a large number of very precise "atomic clocks" at
laboratories around the world, including the U.S. Naval Observatory.
To obtain U.S. civil time from UTC, use the following table.
To obtain Atlantic Daylight Timesubtract 3 hours from UTC
Atlantic Standard Timesubtract 4 hours from UTC
Eastern Daylight Timesubtract 4 hours from UTC
Eastern Standard Timesubtract 5 hours from UTC
Central Daylight Timesubtract 5 hours from UTC
Central Standard Timesubtract 6 hours from UTC
Mountain Daylight Timesubtract 6 hours from UTC
Mountain Standard Timesubtract 7 hours from UTC
Pacific Daylight Timesubtract 7 hours from UTC
Pacific Standard Timesubtract 8 hours from UTC
Alaska Daylight Timesubtract 8 hours from UTC
Alaska Standard Timesubtract 9 hours from UTC
Hawaii-Aleutian Daylight Time subtract 9 hours from UTC
Hawaii-Aleutian Standard Time subtract 10 hours from UTC
Samoa Standard Timesubtract 11 hours from UTC
Thus, 11:00 UTC is the same as 5:00 CST. When converting zone time to or
from UTC, dates must be properly taken into account. For example, 10 March
at 02:00 UTC is the same as 9 March at 21:00 EST. The table can also be
used to determine the difference between the time observed in any two
zones. For example, the table shows that Eastern Standard Time is three
hours "ahead" of Pacific Standard Time.
Time zones in the U.S. are defined in the U.S. Code, Title 15, Chapter 6,
Subchapter IX - Standard Time. The Department of Transportation is
responsible for time zone boundaries.
See also the world time zone map.
For more information on time, time scales, and accurate clocks, see the
U.S. Naval Observatory Time Service Department pages. Related information
can be found on the pages of the National Institute of Standards and
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