Time in the United States, by justness, is divided into nine well-worn metre zones top the states and its possessions, with most of the United States observing daylight saving eon for part of the year. The period zone boundaries and DST observance are at a lower place the federal agency of the Department of Transportation. Official and highly precise time retentiveness service (clocks) are provided by two federal time agencies: a Department of Commerce agency, the National Institute of standardiseds and Technology (NIST), and its armed forces counterpart, the United States Naval Observatory (USNO). The clocks run by these services are kept synchronized with each another(prenominal) as well as with those of international time keeping organizations.
It is the combination of the time zone and daylight saving rules on with the time keeping services which determines the legal civil time for any U.S. location at any moment.
United States time zones
metre time zones in the United States are presently defined at the federal level by law 15 U.S.C. §260. The federal law also establishes the transition dates and clock at which daylight saving time occurs, if observed.
It is ultimately the authority of the Secretary of Transportation, in coordination with the states, to determine which regions will observe which of the standard time zones and if they will observe daylight saving time. As of August 9, 2007, the standard time zones are defined in terms of hourly offsets from UTC.[1] Prior to this they were based upon the mean solar time at several meridians 15° apart due westward of Greenwich (GMT).
Only the full time zone names listed below are official; abbreviations are by common role conventions.
The United States uses nine standard time zones. From east to west they are Atlantic criterion 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),...If you want to get a full essay, order it on our website: Orderessay
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