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TIME ZONE OF THE UNITED STATES |
The United States uses nine standard time zones. From east to west they are - Atlantic Standard Time (AST), Eastern Standard Time (EST) Central Standard Time (CST), Mountain Standard Time Pacific Standard Time (MST software) (PST), Alaskan Standard Time (AKST), Aleutian Hawaii Standard Time (HST), Samoa standard time (UTC-11) and Standard Time Chamorro (UTC +10). Consider the standard time zone boundaries.
Daylight saving time begins at 2:00 am local time on the second Sunday in March. On the first Sunday in November areas on the Summer Time reverts to standard time at 2:00. The names in each time zone change along with Daylight Saving Time. Eastern Standard Time (EST) becomes Eastern Daylight Time (EDT), etc. Arizona, Puerto Rico, Hawaii, U.S. Virgin Islands and American Samoa do not observe Daylight Saving Time. Read more about the new federal law, which came into force in March 2007, which extended daylight saving time by four weeks.
Map of time zones of the United States
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