North American time zones:

AST - Atlantic Standard Time

Time zone offset: UTC - 4 hours

AST is 4 hours behind of Coordinated Universal Time (UTC)

Note that during summer daylight saving time/summer time is observed, and ADT is used instead.

Time zone abbreviations: AST, HNA

Full name is Atlantic Standard Time
HNA – Heure Normale de l'Atlantique (French)

Email time zone indicator: -0400

An email sent from someone in the AST time zone will have the time zone listed as "-0400" in the headers of the email. (However, "-0400" does not have to be in AST, as other time zones could have the same UTC offset).

For actual dates DST might be observed, look at the examples below

Advertising

Where and when is AST observed?

AST is used during winter in these Canadian provinces (ADT during summer)

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

Time zone maps are under development and will be available later

Example location in AST

Halifax - during winter

Other time zones in North America

Go directly through the links below, or see the North America time zone list

NST - Newfoundland Standard Time
NDT - Newfoundland Daylight Time
ADT - Atlantic Daylight Time
EST - Eastern Standard Time
EDT - Eastern Daylight Time
CST - Central Standard Time
CDT - Central Daylight Time
MST - Mountain Standard Time
MDT - Mountain Daylight Time
PST - Pacific Standard Time
PDT - Pacific Daylight Time
AKST - Alaska Standard Time
AKDT - Alaska Daylight Time
HAST - Hawaii-Aleutian Standard Time
HADT - Hawaii-Aleutian Daylight Time

Time zones in other regions

More regions will be available later

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