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That is west of 169 degrees 30 minutes west longitude observes the Hawaii and a portion of the Aleutian Islands That is east of 169 degrees 30 minutes west longitude observes the Alaska Time Oregon, part of South Dakota, part of Texas, Utah, and WyomingĬalifornia, part of Idaho, Nevada, most ofĪlaska and a portion of the Aleutian Islands Kansas, Montana, part of Nebraska, New Mexico, part of North Dakota, part of South Dakota, part of Tennessee, most of Texas, and WisconsinĪrizona*, Colorado, part of Idaho, part of Minnesota, Mississippi, Missouri, Nebraska, North Dakota, Oklahoma, part of Indiana, Iowa, part of Kansas, part of Kentucky, Louisiana, part of Michigan, Island, South Carolina, part of Tennessee, Vermont Virginia, and West VirginiaĪlabama, Arkansas, Florida, Illinois, part of

Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Of Indiana, part of Kentucky, Maine, Maryland, Massachusetts, Michigan, New The following tables identify the standard time zone boundaries and theĮxamples of Places in the United States inĬonnecticut, Delaware, Florida, Georgia, part (UTC-11) and Chamorro Standard Time (UTC+10). Standard Time (AKST), Hawaii-Aleutian Standard Time (HST), Samoa standard time Time (CST), Mountain Standard Time (MST), Pacific Standard Time (PST), Alaskan From east to west theyĪre Atlantic Standard Time (AST), Eastern Standard Time (EST), Central Standard The United States uses nine standard time zones. A new federal law tookĮffect in March 2007 which extends Daylight Saving Time by four weeks. Eastern Standard Time (EST)īecomes Eastern Daylight Time (EDT), and so forth. Time zone change along with Daylight Saving Time. On the first Sunday in November areas onĭaylight Saving Time return to Standard Time at 2:00 a.m. In the United States Daylight Saving Time begins at 2:00 a.m. Virgin Islands and American Samoa do not observe Daylight Saving Time. GMT offset will remain the same year round. In places not observing Daylight Saving Time the local UTC or AsĪ result, their UTC or GMT offset would change from UTC -5h or GMT - 5h to UTC Residents move their clocks ahead one hour when Daylight Saving Time begins. In areas of the United States that observe Daylight Saving Time, local

UTC is also known as Zulu Time or Z time. Match earth-motion time, where as Greenwich Mean Time is based upon the Earth's UTC is based on cesium-beam atomic clocks, with leap seconds added to The Greenwich meridian in Greenwich, England. To military time, and is based upon the 0° longitude meridian, referred to as The usage of UTC and GMT is based upon a twenty four hour clock, similar Would refer to that time zone being five hours ahead of UTC of GMT and so forth In this example, the (-5h) refers to that time zone being five hoursīehind UTC or GMT and so forth for the other time zones. Sometimes time zones are represented similar to UTC - 5h or GMT Coordinated Universal Time replaced the use of Greenwich Mean Time Coordinated Universal Time (UTC) is used as the official world referenceįor time.