Atlantic Standard Time Zone

Atlantic Standard Time Zone
This article is about the time zone with daylight change in North America. For the static time zone, see UTC−04.
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


v · Time zones in North America
Hours from GMT Standard time Daylight saving
–10 Hawaii-Aleutian
–9 Alaska Hawaii-Aleutian
–8 Pacific Alaska
–7 Mountain Pacific
–6 Central Mountain
–5 Eastern Central
–4 Atlantic Eastern
–3:30 Newfoundland
–3 Saint Pierre and Miquelon Atlantic
–2:30 Newfoundland
–2 Saint Pierre and Miquelon
See also: Time in Canada • Time in Mexico • Time in the United States

Sources

v · d · eCoordinated Universal Time (UTC)
UTC offset for standard time and
Daylight saving time (DST)
Italics: historical only
−12:00 • −11:30 • −11:00 • −10:30 • −10:00 • −09:30 • −09:00 • −08:30 • −08:00 • −07:00
90°W to < 0°
−06:00 • −05:00 • −04:30 • −04:00 • −03:30 • −03:00 • −02:30 • −02:00 • −01:00 • −00:44 • −00:25
0° to < 90°E
±00:00 • +00:20 • +00:30 • +01:00 • +01:24 • +01:30 • +02:00 • +02:30 • +03:00 • +03:30 • +04:00 • +04:30 • +04:51 • +05:00 • +05:30 • +05:40 • +05:45
+06:00 • +06:30 • +07:00 • +07:20 • +07:30 • +08:00 • +08:30 • +08:45 • +09:00 • +09:30 • +09:45 • +10:00 • +10:30 • +11:00 • +11:30
(180° to < 90°W)
+12:00 • +12:45 • +13:00 • +13:45 • +14:00
Time zone data sources
Lists of time zones
time zones by country • time zones by UTC offset • tz database time zones • military time zones • time zone abbreviations • daylight saving time by country

References

  1. ^ "CHAPTER T-6 - Time Definition Act". http://www.gnb.ca/0062/acts/acts/t-06.htm. Retrieved 2008-06-02. 
  2. ^ "Time Definition Act". http://www.gov.ns.ca/legislature/legc/statutes/timedefn.htm. Retrieved 2008-06-02. 
  3. ^ "RSNL1990 CHAPTER S-23 - STANDARD TIME ACT". http://www.assembly.nl.ca/legislation/sr/statutes/s23.htm. Retrieved 2007-11-16. 

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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

  • 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

  • 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

  • Wake Island Time Zone — The Wake Island Time Zone observes standard time by adding twelve hours to Coordinated Universal Time (UTC+12). The clock time in this zone is based on the mean solar time of the 180th degree meridian east of the Greenwich Observatory.The zone… …   Wikipedia

  • Samoa Time Zone — The Samoa Time Zone observes standard time by subtracting eleven hours from Coordinated Universal Time (UTC 11). The clock time in this zone is based on the mean solar time of the 165th degree meridian west of the Greenwich Observatory.The zone… …   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

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