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North American time zones:

AST – Atlantic Standard Time

Important

Only some locations are currently on AST, because most places there are currently on Daylight Saving Time.

Locations that are on AST part of the year are currently on ADT (Atlantic Daylight Time).

Current time in Blanc-Sablon

Friday, August 2, 2013 at 3:23:56 PM AST

Blanc-Sablon is on AST all of year 2013

Locations going to AST later

Current time in Halifax: Friday, August 2, 2013 at 4:23:56 PM ADT
Halifax will stay on ADT until Sunday, November 3, 2013 going to AST

Find local time and time zone for a location

We recommend looking up by location name, not time zone name.

Time zone offset: UTC - 4 hours

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

Note that most places observe daylight saving time/summer time during summer, and are therefore using ADT instead in the summer. See below for details.

Time zone abbreviations: AST, HNA

Full name is Atlantic Standard Time
HNA – Heure Normale de l'Atlantique (French)
AST – Tiempo Estándar del Atlántico (Spanish)

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

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Where and when is AST observed?

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

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

Regions using AST all year

Quebec - East of 63 West only.

Areas using AST in the winter and ADT during the summer

Greenland - Thule area only
Nova Scotia

Time zone maps are under development and will be available later

Example locations in AST

Blanc-Sablon - This time zone offset is used all year in this location
Halifax - This time zone offset is used during winter in this location

Other time zones in North America

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

ADT - Atlantic Daylight Time
AKDT - Alaska Daylight Time
AKST - Alaska Standard Time
CDT - Central Daylight Time
CST - Central Standard Time
EDT - Eastern Daylight Time
EGST - Eastern Greenland Summer Time
EGT - East Greenland Time
EST - Eastern Standard Time
HADT - Hawaii-Aleutian Daylight Time
HAST - Hawaii-Aleutian Standard Time
MDT - Mountain Daylight Time
MST - Mountain Standard Time
NDT - Newfoundland Daylight Time
NST - Newfoundland Standard Time
PDT - Pacific Daylight Time
PMDT - Pierre & Miquelon Daylight Time
PMST - Pierre & Miquelon Standard Time
PST - Pacific Standard Time
WGST - Western Greenland Summer Time
WGT - West Greenland Time