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AST – Atlantic Standard Time / Atlantic Time (Standard Time)

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

Also known as: AT – Atlantic Time

North America: Only some locations are currently on AST because most places in this time zone are currently on summer time / daylight saving time and are observing ADT.

Atlantic: AST is currently not observed because locations are on summer time / daylight saving time and are observing ADT.

Time zone map of AST
Currently observing AST.
Observes AST part of the year.
Areas with same time currently (UTC -4).
Currently observing AST – Atlantic Standard Time.
Observes AST – Atlantic Standard Time part of the year, but not currently.
Currently has same time zone offset as AST (UTC -4) but different time zone name.

Atlantic Standard Time (AST) is 4 hours behind Coordinated Universal Time (UTC). This time zone is in use during standard time in: North America, Atlantic, Caribbean.

This time zone is often called Atlantic Time Zone.

See full time zone map

Summer Time & DST

Some places observe daylight saving time/summer time during the summer, and therefore use ADT (Atlantic Daylight Time) in the summer.

Where and When is AST Observed?

North America

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

Canadian provinces using AST all year:

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

Atlantic

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

Caribbean

Caribbean countries/territories using AST all year:

Other Time Zones in UTC -4

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