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Atlantic Standard Time

 
Dictionary: Atlantic Standard Time
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n. (Abbr. AST)
Standard time in the fourth time zone west of Greenwich, England, reckoned at 60° west and used, for example, in Puerto Rico and the Canadian Maritime Provinces. Also called Atlantic Time.


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WordNet: Atlantic Standard Time
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Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: 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
  Synonym: Atlantic Time

Wikipedia: Atlantic Standard Time Zone
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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.

Other parts of the world that keep time by subtracting four hours from UTC include Bermuda, in the North Atlantic; many Caribbean islands, including Puerto Rico, the US Virgin Islands; and several South American countries, such as Paraguay, Chile, Bolivia, and parts of Brazil. Venezuela used AST until December 9, 2007, when it switched to UTC-4:30.

AST is known (where applicable) as Atlantic Daylight Time (ADT) during daylight saving time, and has one hour added to make it three hours behind GMT (UTC-3).

Major metropolitan areas


v • d • e
Time zones in North America
Time Zone UTC-10 UTC-9 UTC-8 UTC-7 UTC-6 UTC-5 UTC-4 UTC-3:30 UTC-3 UTC-2:30 UTC-2
Name Hawaii-Aleutian Standard Alaska Standard Pacific Standard Mountain Standard Central Standard Eastern Standard Atlantic Standard Newfoundland Standard Saint Pierre and Miquelon Standard
Hawaii-Aleutian Daylight Alaska Daylight Pacific Daylight Mountain Daylight Central Daylight Eastern Daylight Atlantic Daylight Newfoundland Daylight Saint Pierre and Miquelon Daylight

Sources

v • d • e
Time offsets from Coordinated Universal Time (UTC)
−12 · −11 · −10 · −9:30 · −9 · −8 · −7 · −6 · −5 · −4:30 · −4 · −3:30 · −3 · −2:30 · −2 · −1 · −0:44 · −0:25 · UTC (0) · +0:20 · +0:30 · +1 · +2 · +3 · +3:30 · +4 · +4:30 · +4:51 · +5 · +5:30 · +5:40 · +5:45 · +6 · +6:30 · +7 · +7:20 · +7:30 · +8 · +8:30 · +8:45 · +9 · +9:30 · +10 · +10:30 · +11 · +11:30 · +12 · +12:45 · +13 · +13:45 · +14
Daylight saving time (DST) · Northern Hemisphere · Southern Hemisphere · Historical Only

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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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Atlantic Standard Time Zone".  Read more