UNIX Timestamp to Atlantic Time
Convert UNIX timestamps, epoch times, and ISO dates to Atlantic Time (AST/ADT). Current offset: UTC-4 (winter) / UTC-3 (summer). Atlantic Canada observes DST; most Caribbean islands do not.
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About Atlantic Time
- IANA Name
- America/Halifax
- Abbreviation
- AST/ADT
- UTC Offset
- UTC-4 (winter) / UTC-3 (summer)
- Region
- North America / Caribbean
- Major Cities
- Halifax, San Juan, Santo Domingo, Bridgetown, Hamilton
- Daylight Saving
- Yes
Frequently asked questions
Which regions use Atlantic Time?
Atlantic Canada (Nova Scotia, New Brunswick, Prince Edward Island), Bermuda, and the Caribbean (Puerto Rico, Dominican Republic, Barbados, and many others) use UTC-4. Note that Caribbean islands do not observe DST.
What is the difference between Atlantic and Eastern Time?
Atlantic Time (AST, UTC-4) is one hour ahead of Eastern Time (EST, UTC-5). When it is noon in Halifax, it is 11:00 AM in New York.
Does the Caribbean observe daylight saving?
No. Most Caribbean islands stay at UTC-4 (AST) year-round. Only Atlantic Canada and Bermuda observe DST, switching to ADT (UTC-3) in summer.