Time zone
Atlantic Time Area Codes
Atlantic Time is one hour ahead of Eastern and covers Puerto Rico and the U.S. Virgin Islands. 3 area codes across 2 states and territories fall in this zone.
What the Atlantic Time zone covers
The Atlantic Time zone includes Puerto Rico, U.S. Virgin Islands. Atlantic Time is one hour ahead of Eastern and covers Puerto Rico and the U.S. Virgin Islands.
UTC offset and daylight saving
This zone runs at UTC−4 year-round (AST). It does not observe daylight saving time. Puerto Rico and the U.S. Virgin Islands keep Atlantic Standard Time all year, so in summer they line up with Eastern Daylight Time.
Best time to call this zone
Standard business hours (9 a.m. to 5 p.m.) in this zone are when you're most likely to reach an office or store. Puerto Rico and the U.S. Virgin Islands keep Atlantic Standard Time all year, so in summer they line up with Eastern Daylight Time. If you only have a phone number, our phone number finder tells you which zone it belongs to.
Full list
Every Atlantic Time area code
| Code | Main city | State |
|---|---|---|
| 340 | Charlotte Amalie | U.S. Virgin Islands |
| 787 | San Juan | Puerto Rico |
| 939 | San Juan | Puerto Rico |
Other zones: Eastern Time · Central Time · Mountain Time · Pacific Time · Alaska Time · Hawaii–Aleutian Time.
Quick answers
Atlantic Time FAQ
What is the UTC offset for Atlantic Time?
Atlantic Time is UTC−4 year-round (AST).
Does Atlantic Time use daylight saving time?
No, this zone keeps the same time year-round.
How many area codes are in Atlantic Time?
3 US area codes fall in the Atlantic Time zone, across 2 states and territories.