Atlantic Time

Atlantic Time (AT) is a term which refers to the local time in areas observing either Atlantic Standard Time (AST) or Atlantic Daylight Time (ADT).

What time is it Atlantic Time?

Atlantic Time Zone GMT/UTC offset

Atlantic Standard Time is 4 hours behind Coordinated Universal Time (UTC).

Atlantic Daylight Time is 3 hours behind UTC.

Time zone difference

Time zone	Difference
Atlantic Time to Eastern Time	1 hour ahead of Eastern Time
Atlantic Time to Central Time	2 hours ahead of Central Time
Atlantic Time to Mountain Time	3 hours ahead of Mountain Time
Atlantic Time to Pacific Time	4 hours ahead of Pacific Time

Abbreviations

Abbreviation	Name
AT	Atlantic Time
AST	Atlantic Standard Time
ADT	Atlantic Daylight Time

Daylight Saving Time in 2025

DST starts on Sunday 09 March 2025, 02:00 standard time
Move your clock forward 1 hour
DST ends on Sunday 02 November 2025, 02:00 daylight time
Move your clock back 1 hour

Iana Timezones where AT is currently observed

America/Anguilla	America/Antigua
America/Aruba	America/Barbados
America/Blanc-Sablon	America/Curacao
America/Dominica	America/Glace_Bay
America/Goose_Bay	America/Grenada
America/Guadeloupe	America/Halifax
America/Kralendijk	America/Lower_Princes
America/Marigot	America/Martinique
America/Moncton	America/Montserrat
America/Port_of_Spain	America/Puerto_Rico
America/Santo_Domingo	America/St_Barthelemy
America/St_Kitts	America/St_Lucia
America/St_Thomas	America/St_Vincent
America/Thule	America/Tortola
Atlantic/Bermuda

What time is it in Atlantic Time zone now? Check where PT is currently observed and what are the corresponding time zones

What is Atlantic Time: abbreviations, main facts, UTC offset and other information.