Atlantic Time Zone

Atlantic Time Zone
UTC offset
AST UTC−4:00
ADT UTC−3:00
Observance 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 Mar 12, 2017
DST ends Nov 5, 2017

The Atlantic Time Zone is a geographical region that keeps standard time—called Atlantic Standard Time (AST)—by subtracting four hours from Coordinated Universal Time (UTC), resulting in UTC-4; during part of the year some parts of it observe daylight saving time by instead subtracting only three hours (UTC-3). 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] Nova Scotia,[2] and Prince Edward Island reckon time specifically as an offset of 4 hours from Greenwich Mean time (GMT-4). 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.

No portion of the continental United States is located in the Atlantic Time Zone; however the territories of Puerto Rico and the U.S. Virgin Islands do fall under Atlantic Standard Time. A Massachusetts commission and other New England states are studying the possibility of changing to Atlantic Time year round.[4]

Those portions of the Atlantic 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).

Areas covered

See also

References

  1. ↑ "CHAPTER T-6 – Time Definition Act" (PDF). Archived from the original (PDF) on 2008-12-07. Retrieved 2012-09-11.
  2. ↑ "Time Definition Act". Archived from the original on 5 June 2008. Retrieved 2008-06-02.
  3. ↑ "RSNL1990 CHAPTER S-23 – STANDARD TIME ACT". Retrieved 2007-11-16.
  4. ↑ "Is it time for Mass. to move to a new time zone? - The Boston Globe". BostonGlobe.com. Retrieved 2017-03-17.
  5. ↑
Time zones in North America
Time zone Hours from UTC: Standard time Hours from UTC: Daylight saving time
Hawaii–Aleutian (in Hawaii) –10 –10
Hawaii–Aleutian (in Alaska) –10 –9
Alaska –9 –8
Pacific –8 –7
Mountain (Arizona and Sonora only) –7 –7
Mountain (other states) –7 –6
Central (Saskatchewan only) –6 –6
Central (other states) –6 –5
Eastern (Southampton Island,Atikokan and New Osnaburgh/Pickle Lakeonly) –5 –5
Eastern (other states) –5 –4
Atlantic (Natashquan River) –4 –4
Atlantic (other states) –4 –3
Newfoundland –3:30 –2:30
Saint Pierre and Miquelon
and most of Greenland		 –3 –2
See also
Time in Canada
Time in Denmark
Time in Mexico
Time in the United States
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