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North American time zones:

ADT – Atlantic Daylight Time

Important

ADT is only used while Daylight Saving Time is active.

During this time of year, locations on ADT are now on AST (Atlantic Standard Time) instead.

Currently no cities are observing ADT

Locations going to ADT later

Current time in Halifax: Sunday, December 2, 2012 at 10:31:19 PM AST
Halifax will stay on AST until Sunday, March 10, 2013 going to ADT

Find local time and time zone for a location

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

Time zone offset: UTC - 3 hours

ADT is 3 hours behind of Coordinated Universal Time (UTC)

Note that ADT is a daylight saving time/summer time zone. It is generally only used during the summer in the places listed below, during the winter AST is used instead

Time zone abbreviations: ADT, HAA

Full name is Atlantic Daylight Time
HAA – Heure Avancée de l'Atlantique (French)

Email time zone indicator: -0300

An email sent from someone in the ADT time zone will have the time zone listed as "-0300" in the headers of the email. (However, "-0300" does not have to be in ADT, 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 ADT observed?

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

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

Areas using ADT in the summer and AST during the winter

Greenland - Thule area only
Nova Scotia

Time zone maps are under development and will be available later

Example location in ADT

Halifax - This time zone offset is used during summer in this location

Other time zones in North America

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

AKDT - Alaska Daylight Time
AKST - Alaska Standard Time
AST - Atlantic 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