Atlantic Daylight Time Zone - ADT

Atlantic Daylight Time or ADT has a UTC offset of - 3:00. This means that the time zone is 3 hours behind Coordinated Universal Time. The time zone is primarily observed by territories in North America (Canada) and the Atlantic during the summer months when Daylight Saving is active. As soon as Daylight Saving ends – during the winter – some affected areas switch to Atlantic Standard Time or AST.

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

• Atlantic Standard Time (AST)

• Atlantic Daylight Saving Time (ADST)

• Atlantic Summer Time (AST)

• Heure Avancee de l’Atlantique (HAA) in French

Locations in Atlantic Daylight Time Zone:

This time zone is active in:

• North America

  • Canada

    • Mainland Labrador and Newfoundland

    • New Brunswick

    • Nova Scotia

    • Prince Edward Island

• Greenland

  • Thule area

• Atlantic

  • Bermuda

Other time zones that use the same UTC - 3:00 offset are:

• Amazon Summer Time (AMST)

• Argentina Time (ART)

• Brasilia Time (BRT)

• Chile Summer Time (CLST)

• Chile Standard Time (CLT)

• Falkland Islands Summer Time (FKST)

• French Guiana Time (GFT)

• Papa Time Zone (P)

• Pierre & Miquelon Standard Time (PMST)

• Paraguay Summer Time (PYST)

• Rothera Time (ROTT)

• Suriname Time (SRT)

• Uruguay Time (UYT)

• Western Argentine Summer Time (WARST)

• West Greenland Time (WGT)