EST to AST: EST is 1 hour behind AST
Eastern Time is 1 hour behind Atlantic Time, on every day of the year. It is 11:20 pm EDT in Eastern and 12:20 am ADT in Atlantic, which is already the next day there.
Convert a specific time from EST to AST
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 EST and AST?
Atlantic Time is 1 hour ahead of Eastern Time. To go from EST to AST you add 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.
EST to AST conversion table
Every hour of Thursday, September 24, 2026 in Eastern, with the matching reading in Atlantic. 1 of the 24 hours land on a different calendar date in Atlantic, which is the part people get wrong when they schedule across this pair.
| EST | EST 24h | AST | AST 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 1:00 am | 01:00 | same day |
| 1:00 am | 01:00 | 2:00 am | 02:00 | same day |
| 2:00 am | 02:00 | 3:00 am | 03:00 | same day |
| 3:00 am | 03:00 | 4:00 am | 04:00 | same day |
| 4:00 am | 04:00 | 5:00 am | 05:00 | same day |
| 5:00 am | 05:00 | 6:00 am | 06:00 | same day |
| 6:00 am | 06:00 | 7:00 am | 07:00 | same day |
| 7:00 am | 07:00 | 8:00 am | 08:00 | same day |
| 8:00 am | 08:00 | 9:00 am | 09:00 | same day |
| 9:00 am | 09:00 | 10:00 am | 10:00 | same day |
| 10:00 am | 10:00 | 11:00 am | 11:00 | same day |
| 11:00 am | 11:00 | 12:00 pm | 12:00 | same day |
| 12:00 pm | 12:00 | 1:00 pm | 13:00 | same day |
| 1:00 pm | 13:00 | 2:00 pm | 14:00 | same day |
| 2:00 pm | 14:00 | 3:00 pm | 15:00 | same day |
| 3:00 pm | 15:00 | 4:00 pm | 16:00 | same day |
| 4:00 pm | 16:00 | 5:00 pm | 17:00 | same day |
| 5:00 pm | 17:00 | 6:00 pm | 18:00 | same day |
| 6:00 pm | 18:00 | 7:00 pm | 19:00 | same day |
| 7:00 pm | 19:00 | 8:00 pm | 20:00 | same day |
| 8:00 pm | 20:00 | 9:00 pm | 21:00 | same day |
| 9:00 pm | 21:00 | 10:00 pm | 22:00 | same day |
| 10:00 pm | 22:00 | 11:00 pm | 23:00 | same day |
| 11:00 pm | 23:00 | 12:00 am | 00:00 | the next day |
What are the best hours to schedule a call between EST and AST?
7 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 9:00 am EST to 4:00 pm EST. In Atlantic that window reads 10:00 am to 5:00 pm. Outside it, one side is either not yet at their desk or already gone.
| EST | AST | Working hours | Note |
|---|---|---|---|
| 9:00 am | 10:00 am | both sides | mid morning in Eastern, mid morning in Atlantic |
| 10:00 am | 11:00 am | both sides | mid morning in Eastern, mid morning in Atlantic |
| 11:00 am | 12:00 pm | both sides | mid morning in Eastern, noon in Atlantic |
| 12:00 pm | 1:00 pm | both sides | noon in Eastern, afternoon in Atlantic |
| 1:00 pm | 2:00 pm | both sides | afternoon in Eastern, afternoon in Atlantic |
| 2:00 pm | 3:00 pm | both sides | afternoon in Eastern, afternoon in Atlantic |
| 3:00 pm | 4:00 pm | both sides | afternoon in Eastern, afternoon in Atlantic |
Does daylight saving change EST to AST?
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.
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.
Is EST ahead of or behind AST?
EST is behind AST by 1 hour: when it is 12:00 pm in Eastern, it is 1:00 pm in Atlantic. One wrinkle worth knowing: EST and EDT are two names for the same zone, not two zones. Eastern Time reads EST in winter and EDT in summer. When somebody types "est to ast" they nearly always mean the zone rather than the literal winter offset, so this page resolves EST to America/New_York and AST to America/Halifax and applies whichever offset is genuinely in force on the day.
Eastern Time covers New York, Toronto, Atlanta and Miami. Atlantic Time covers Halifax, Moncton and the Canadian Maritimes. The identifiers behind them are America/New_York and America/Halifax, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is EST in AST?
- EST is 1 hour behind AST. 9:00 am EST is 10:00 am AST.
- How many hours ahead is AST of EST?
- AST is 1 hour ahead of EST.
- What time is it in Atlantic right now?
- 12:20 am ADT on Friday, September 25, 2026.
- When can Eastern and Atlantic meet during working hours?
- Between 9:00 am and 4:00 pm EST, which is 10:00 am to 5:00 pm AST.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so EDT and ADT are the abbreviations genuinely in force today rather than a fixed assumption.
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