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AT – Atlantic Time

Time zone map of ADT
Currently observing ADT.
Areas with same time currently (UTC -3).
Currently observing ADT – Atlantic Daylight Time.
Currently has same time zone offset as ADT (UTC -3) but different time zone name.

The term Atlantic Time (AT) is often used to denote the local time in areas observing either Atlantic Daylight Time (ADT) or Atlantic Standard Time (AST).

Atlantic Standard Time is 4 hours behind Coordinated Universal Time (UTC).

Atlantic Daylight Time is 3 hours behind UTC.

In locations observing Daylight Saving Time (DST) during part of the year, Atlantic Time is not static but switches between ADT and AST.

See full time zone map

Where and when is Atlantic Time observed?

North America

Canadian provinces using AST in the winter and ADT in the summer

  • Most of Labrador (mainland part of the province of Newfoundland and Labrador)
  • New Brunswick
  • Nova Scotia
  • Prince Edward Island

Areas of Greenland using AST in the winter and ADT in the summer

  • Thule area

Atlantic

Atlantic islands/territories using AST in the winter and ADT in the summer

  • Bermuda

AST all year round

Some locations, such as the ones below don't switch and are in AST all year long.

North America

Canadian provinces using AST all year

  • Quebec - East of 63 West only.

Caribbean

Caribbean countries/territories using AST all year

  • Anguilla
  • Antigua and Barbuda
  • Aruba
  • Barbados
  • British Virgin Islands
  • Caribbean NetherlandsShow

    Bonaire, Sint Eustatius, Saba

  • Curaçao
  • Dominica
  • Dominican Republic
  • Grenada
  • Guadeloupe
  • Martinique
  • Montserrat
  • Puerto Rico
  • Saint Barthélemy
  • Saint Kitts and Nevis
  • Saint Lucia
  • Saint Martin (FR)
  • Saint Vincent and Grenadines
  • Sint Maarten (NL)
  • Trinidad and Tobago
  • Turks and Caicos Islands
  • US Virgin Islands

Time zones by continent/region

See all Time zone abbreviations

Time zones Tools

Atlantic Time now (ADT)

am:58null

Tuesday, July 16, 2019

  • ADT will be observed in Halifax, Hamilton until Nov 3, 2019 at 2:00 am
  • UTC Offset: UTC -3
  • 1 hour ahead of Washington DC
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Find current time and time zone by city

Example cities

Canada – Halifax
Bermuda – Hamilton

Related time zones

AST – Atlantic Standard Time
ADT – Atlantic Daylight Time

Time Zone Map with DST

Time zone map

Time Zone Map

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