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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

No locations currently on ADT. Would you like to see AST?

North America, Atlantic: ADT is currently not observed because locations are on standard time and are observing AST.

Time zone map of ADT
No locations currently on ADT.
Observes ADT part of the year.
Areas with same time currently (UTC -3).
No locations are currently on ADT – Atlantic Daylight Time.
Observes ADT – Atlantic Daylight Time part of the year, but not currently.
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:

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


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

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: