Atlantic time zones:

ADT – Atlantic Daylight Time

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

Advertising

Where and when is ADT observed?

Areas using ADT in the summer and AST during the winter

• Bermuda

Time zone maps are under development and will be available later

Example location in ADT

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

Other time zones in Atlantic

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

• AST - Atlantic Standard Time
• AZOST - Azores Summer Time
• AZOT - Azores Time

Time zones in other regions

• Africa
• Antarctica
• Asia
• Australia
• Caribbean
• Central America
• Europe
• Indian Ocean
• Military
• North America
• Pacific
• South America

Related links

• Time zone abbreviations world-wide
• The World Clock - Time Zones - current time around the world
• The World Clock - Time Zone Converter - Convert between time zones