Home   Time Zones   Abbreviations   AT – Atlantic Time

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

Atlantic Time now (ADT)

am:47null

Wednesday, October 24, 2018

  • ADT will be observed in Halifax, Hamilton until Nov 4, 2018 at 2:00 am
  • UTC Offset: UTC -3
  • 1 hour ahead of Washington DC

Advertising

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

You might also like

Alternative Time Systems

Astronomers use other measures of time, such as Terrestrial Time (TT), which is 32.184 seconds ahead of International Atomic Time (TAI). more

A comet glowing in the dark winter sky.

What Are Comets?

Comets are small celestial bodies that orbit the Sun. Primarily made of dust and ice, many have a tail (coma) and are thought to be remnants of the formation of the Solar System. more

Farmer holding kidney beans in her hand.

2016 – UN Year of Pulses

The International Year of Pulses aims to increase public awareness of the nutritional benefits of pulses as part of sustainable food production. more