Atlantic Standard Time Zone


Atlantic Standard Time Zone
AST is UTC-4

The Atlantic Standard Time Zone (AST) is a geographical region that keeps time by subtracting four hours from either Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT), resulting in UTC-4 or GMT-4. The clock time in this zone is based on the mean solar time of the 60th meridian west of the Greenwich Observatory.

In Canada, the provinces of New Brunswick[1] and Nova Scotia[2] reckon time specifically as an offset of 4 hours from Greenwich Mean time (GMT-4). (UTC is regularly adjusted by means of leap seconds to keep it synchronized to within 1 second of GMT.) Prince Edward Island and small portions of Quebec (eastern Côte-Nord and the Magdalen Islands) are also part of the Atlantic Standard Time Zone. Officially, the entirety of Newfoundland and Labrador observes Newfoundland Standard Time,[3] but in practice most of Labrador uses the Atlantic Standard Time Zone.

For other parts of the world that keep time by subtracting four hours from UTC see UTC−04.

Those portions of the Atlantic Standard Time Zone that participate in daylight saving time do so as Atlantic Daylight Time (ADT), which has one hour added to make it only three hours behind GMT (UTC-3).

Major metropolitan areas


Sources

References


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Atlantic Standard Time — n. a standard time used in the zone which includes Bermuda, Nova Scotia, New Brunswick, and E Quebec, corresponding to the mean solar time of the 60th meridian west of Greenwich, England: it is four hours behind Greenwich time: see TIME ZONE * *… …   Universalium

  • Atlantic Standard Time — n. a standard time used in the zone which includes Bermuda, Nova Scotia, New Brunswick, and E Quebec, corresponding to the mean solar time of the 60th meridian west of Greenwich, England: it is four hours behind Greenwich time: see TIME ZONE …   English World dictionary

  • Atlantic Standard Time — noun standard time in the 4th time zone west of Greenwich, reckoned at the 60th meridian; used in Puerto Rico and the Virgin Islands and Bermuda and the Canadian Maritime Provinces • Syn: ↑Atlantic Time • Hypernyms: ↑civil time, ↑standard time,… …   Useful english dictionary

  • Atlantic Standard Time — noun The time of day in the time zone that encompasses most of the state of Alaska. No its not the AST encompasses the east coast of Canada which sits on the Atlantic Ocean , hence the name Atlantic Standard Time …   Wiktionary

  • Atlantic Standard Time — n. Canadian time zone four hours behind Greenwich time, standard time in the 4th time zone west of Greenwich, reckoned at the 60th meridian …   English contemporary dictionary

  • Newfoundland Standard Time Zone — NST is UTC−3:30 Newfoundland Standard Time[1] (NT) is a geographic region that keeps time by subtracting 3½ hours from Coordinated Universal Time (UTC), resulting in UTC−3:30, or 2½ hours during daylight saving time. The clock time in this zone… …   Wikipedia

  • Yukon Standard Time Zone — The Yukon Standard Time Zone (YST) was a geographic region that kept standard time by subtracting nine hours from Coordinated Universal Time (UTC) resulting in UTC−9 after 1971, or from Greenwich Mean Time (GMT) before 1972.It included the Yukon… …   Wikipedia

  • standard time — ☆ standard time n. 1. the time in any of the 24 time zones, each an hour apart, into which the earth is divided: it is based on distance east or west of Greenwich, England; the 8 zones of North America (Atlantic, Eastern, Central, Mountain,… …   English World dictionary

  • standard time — the civil time officially adopted for a country or region, usually the civil time of some specific meridian lying within the region. The standard time zones in the U.S. (Atlantic time, Eastern time, Central time, Mountain time, Pacific time,… …   Universalium

  • time zone — Synonyms and related words: Alaska time, Atlantic time, Central time, Eastern time, GMT, Greenwich mean time, Greenwich time, Mountain time, Yukon time, apparent time, civil time, daylight saving time, fast time, local time, mean solar time, mean …   Moby Thesaurus


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