What is Atlantic Time (AST)?

Atlantic Time (AST) is UTC−4, shifting to UTC−3 in summer — the clock of Canada's Maritime provinces, one hour ahead of New York.

AST is UTC−4 in standard time and UTC−3 during daylight saving time.

Does Atlantic Time observe daylight saving time?

Yes. The next change is on November 1, 2026, when clocks fall back from ADT to AST.

Atlantic Time (AST) — current time & UTC offset

About Atlantic Time

Standard offset: UTC−4
Daylight offset: UTC−3
Abbreviations: AST, ADT
Observes DST: Yes

Used in: Canada.

Atlantic Time covers Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador — the part of Canada that's an hour ahead of the Eastern Seaboard.

Daylight saving time

Atlantic Time observes daylight saving time. The next transition is on Sunday, November 1, 2026, when clocks fall back from ADT to AST.

See the daylight saving time page for transition dates across every time zone.

Daylight today

Sun times at the representative location for Atlantic Time.

Sunrise: 5:31 AM
Sunset: 8:56 PM
Day length: 15h 25m

Major cities in Atlantic Time

The current local time in these cities matches Atlantic Time.

HalifaxCA

Browse all cities to see the current local time anywhere.

Convert Atlantic Time to

See all conversions

Frequently asked questions

What is Atlantic Time (AST)?: Atlantic Time (AST) is UTC−4, shifting to UTC−3 in summer — the clock of Canada's Maritime provinces, one hour ahead of New York.
What is AST in UTC?: AST is UTC−4 in standard time and UTC−3 during daylight saving time.
Does Atlantic Time observe daylight saving time?: Yes. The next change is on November 1, 2026, when clocks fall back from ADT to AST.