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ADT – Atlantic Daylight Time / Atlantic Daylight Saving Time (Daylight Saving Time)

Time Zone names, codes and abbreviations for Standard Time and Daylight Saving Time (DST) around the world.

Also known as: ADST – Atlantic Daylight Saving Time, AST – Atlantic Summer 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.

Atlantic Daylight Time (ADT) is 3 hours behind Coordinated Universal Time (UTC). This time zone is a Daylight Saving Time time zone and is used in: North America, Atlantic.

This time zone is often called ADT Time Zone.

See full time zone map

Winter Time & DST

This time zone is a daylight saving/summer time zone, in the winter some places will switch to the corresponding standard time zone: AST (Atlantic Standard Time).

Where and When is ADT Observed?

North America

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

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

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

  • Thule area

Atlantic

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

  • Bermuda

Other Time Zones in UTC -3

Some time zones exist that have the same offset as ADT, but can be found under a different name: