AST to EST: AST is 1 hour ahead of EST

Atlantic Time is 1 hour ahead of Eastern Time, on every day of the year. It is 3:18 am ADT in Atlantic and 2:18 am EDT in Eastern.

Convert a specific time from AST to EST

Pick any time and date to convert it both ways. The conversion runs in your browser against the real zone rules, so a date inside a daylight saving period gets that period's offset rather than today's.

What is the time difference between AST and EST?

Eastern Time is 1 hour behind Atlantic Time. To go from AST to EST you subtract 1 hour. That gap holds on all 365 days of 2026: both zones move their clocks, but on the same dates and in the same direction, so the distance between them never changes.

AST to EST conversion table

Every hour of Friday, September 25, 2026 in Atlantic, with the matching reading in Eastern. 1 of the 24 hours land on a different calendar date in Eastern, which is the part people get wrong when they schedule across this pair.

What are the best hours to schedule a call between AST and EST?

7 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 10:00 am AST to 5:00 pm AST. In Eastern that window reads 9:00 am to 4:00 pm. Outside it, one side is either not yet at their desk or already gone.

Does daylight saving change AST to EST?

Atlantic Time is currently on ADT and changes next on Sunday, November 1, 2026, when the clock falls back from 1:59 am to 1:00 am and the offset moves from UTC-3 to UTC-4.

Eastern Time is currently on EDT and changes next on Sunday, November 1, 2026, when the clock falls back from 1:59 am to 1:00 am and the offset moves from UTC-4 to UTC-5.

Is AST ahead of or behind EST?

AST is ahead of EST by 1 hour: when it is 12:00 pm in Atlantic, it is 11:00 am in Eastern. One wrinkle worth knowing: AST and ADT are two names for the same zone, not two zones. Atlantic Time reads AST in winter and ADT in summer. When somebody types "ast to est" they nearly always mean the zone rather than the literal winter offset, so this page resolves AST to America/Halifax and EST to America/New_York and applies whichever offset is genuinely in force on the day.

Atlantic Time covers Halifax, Moncton and the Canadian Maritimes. Eastern Time covers New York, Toronto, Atlanta and Miami. The identifiers behind them are America/Halifax and America/New_York, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.

Questions

What is AST in EST?

AST is 1 hour ahead of EST. 9:00 am AST is 8:00 am EST.

How many hours ahead is EST of AST?

EST is 1 hour behind AST.

What time is it in Eastern right now?

2:18 am EDT on Friday, September 25, 2026.

When can Atlantic and Eastern meet during working hours?

Between 10:00 am and 5:00 pm AST, which is 9:00 am to 4:00 pm EST.

Does this account for daylight saving?

Yes. Every reading is computed from the IANA database for the actual date, so ADT and EDT are the abbreviations genuinely in force today rather than a fixed assumption.

Other conversions

All timezone conversions

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