Atlantic Standard Time
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Atlantic Standard Time
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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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.
| Atlantic Time Zone | |
|---|---|
 |
|
| UTC offset | |
| AST | UTC−4:00 |
| ADT | UTC−3:00 |
| Current time () | |
| ADT | 12:40 am on 28 May 2012 |
| AST | 11:40 pm on 27 May 2012 |
| Obsevance of DST | |
| DST is observed in certain regions of this time zone between the 2nd Sunday in March and the 1st Sunday in November. | |
| DST began | 11 Mar 2012 |
| DST ends | 4 Nov 2012 |
The Atlantic Standard Time Zone (AST) is a geographical region that keeps time by subtracting four hours from Coordinated Universal Time (UTC), resulting in UTC-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
- Hamilton, Bermuda, United Kingdom
- Cape Breton Regional Municipality, Nova Scotia, Canada
- Charlottetown, Prince Edward Island, Canada
- Fredericton, New Brunswick, Canada
- Halifax Regional Municipality, Nova Scotia, Canada
- Moncton, New Brunswick, Canada
- Port of Spain, Trinidad and Tobago [No DST]
- Saint John, New Brunswick, Canada
- Summerside, Prince Edward Island, Canada
- Santo Domingo, Dominican Republic [No DST]
- San Juan, Puerto Rico, United States [No DST]
References
- ^ "CHAPTER T-6 - Time Definition Act". http://www.gnb.ca/0062/acts/acts/t-06.htm. Retrieved 2008-06-02.
- ^ "Time Definition Act". http://www.gov.ns.ca/legislature/legc/statutes/timedefn.htm. Retrieved 2008-06-02.
- ^ "RSNL1990 CHAPTER S-23 - STANDARD TIME ACT". http://www.assembly.nl.ca/legislation/sr/statutes/s23.htm. Retrieved 2007-11-16.
External links
- World time zone map
- U.S. time zone map
- History of U.S. time zones and UTC conversion
- Canada time zone map
- Time zones for major world cities
- Official times across Canada
- The official U.S. time for the Atlantic Time Zone (no DST)
| Time zones in North America | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Hours from UTC | 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 | ||||||||||
|
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American Heritage 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.
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