Time Zone Boundary Lines in the United States

United States Time Zone Map

United States Time Zone Boundary Map

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 (MST), Pacific Standard Time (PST), Alaskan Standard Time (AKST), Hawaii-Aleutian Standard Time (HST), Samoa standard time (UTC-11) and Chamorro Standard Time (UTC+10). View the standard time zone boundaries.

Daylight Saving Time begins at 2:00 a.m. local time on the second Sunday in March. On the first Sunday in November areas on Daylight Saving Time return to Standard Time at 2:00 a.m. The names in each time zone change along with Daylight Saving Time. Eastern Standard Time (EST) becomes Eastern Daylight Time (EDT), and so forth. Arizona, Puerto Rico, Hawaii, U.S. Virgin Islands and American Samoa do not observe Daylight Saving Time. Read more about the new federal law that took effect in March 2007 which extended Daylight Saving Time by four weeks.

Time Zone Boundaries in the United States

CODE UNITED STATES TIME ZONE BOUNDARIES UTC OFFSET
AST ATLANTIC STANDARD TIME UTC - 4
EST EASTERN STANDARD TIME UTC - 5
CST CENTRAL STANDARD TIME UTC - 6
MST MOUNTAIN STANDARD TIME UTC - 7
PST PACIFIC STANDARD TIME UTC - 8
AKST ALASKA STANDARD TIME UTC - 9
HAST HAWAII-ALEUTIAN STANDARD TIME UTC - 10
WST SAMOA STANDARD TIME UTC - 11
CHST CHAMORRO STANDARD TIME UTC +10

Boundary Line Between Eastern and Central Zones
Boundary Line Between Central and Moutain Zones
Boundary Line Between Mountain and Pacific Zones

View Current Times in All United States Cities and Towns



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