Atlantic Time Zone

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Atlantic Time Zone
UTC offset
AST UTC−4:00
ADT UTC−3:00
Current time (Refresh the clock.)
ADT 12:45 am on Oct 21, 2017
AST 11:45 pm on Oct 20, 2017
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 from 2016 and other New England states have been 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[edit]

See also[edit]


  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". 2016-08-11. Retrieved 2017-03-17. 
  5. ^ [1]

External links[edit]