Atlantic Standard Time Zone - AST

Atlantic Standard Time or AST has a UTC offset of - 4:00. This means that the time zone is 4 hours behind Coordinated Universal Time. The time zone is primarily observed by areas of North America, and the Caribbean during the winter months when Daylight Saving is inactive. As soon as Daylight Saving starts – during the summer – some affected areas switch to Atlantic Daylight Time or ADT.

It is important to note that this time zone has several labels:

• Atlantic Standard Time (AST)

• Atlantic Time (AT)

• Tiempo Estandar del Atlantico (AST) in Spanish

• Heure Normale de l'Atlantique (HNA) in French

Locations in Atlantic Standard Time Zone

This time zone is active in:

• North America

  • Canada

    • Mainland Labrador and Newfoundland

    • New Brunswick

    • Nova Scotia

    • Prince Edward Island

    • Quebec

  • Greenland

    • Thule area

  • Caribbean

    • Anguilla

    • Antigua and Barbuda

    • Aruba

    • Barbados

    • Bermuda

    • Bonaire

    • British Virgin Islands

    • Curacao

    • Dominica

    • Dominican Republic

    • France

    • Grenada

    • Guadeloupe

    • Martinique

    • Montserrat

    • Puerto Rico

    • Saint Kitts and Nevis

    • Saint Lucia

    • Saint Vincent and Grenadines

    • Sint Maarten

    • Trinidad and Tobago

    • Turks and Caicos Islands

    • US Virgin Islands

All the Caribbean listed above except for Bermuda, remain on Atlantic Standard Time (AST) all year long and do not observe Daylight Saving. The Canadian province of Quebec also remains on AST all year long.

Other time zones that use the same UTC - 4:00 offset are:

• Amazon Time (AMT)

• Bolivia Time (BOT)

• Cuba Daylight Time (CDT)

• Eastern Daylight Time (EDT)

• Falkland Island Time (FKT)

• Guyana Time (GYT)

• Paraguay Time (PYT)

• Quebec Time (Q)