AST to MSK: AST is 6 hours behind MSK

Atlantic Time is 6 hours behind Moscow Time right now. It is 12:21 am ADT in Atlantic and 6:21 am MSK in Moscow.

Convert a specific time from AST to MSK

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 MSK?

Moscow Time is 6 hours ahead of Atlantic Time. To go from AST to MSK you add 6 hours. That gap is not fixed. Across 2026 the distance between these two zones takes 2 different values, from 6 hours to 7 hours, because Atlantic moves its clocks and Moscow does not. This page recomputes it rather than assuming.

AST to MSK conversion table

Every hour of Friday, September 25, 2026 in Atlantic, with the matching reading in Moscow. 6 of the 24 hours land on a different calendar date in Moscow, 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 MSK?

2 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 9:00 am AST to 11:00 am AST. In Moscow that window reads 3:00 pm to 5:00 pm. Outside it, one side is either not yet at their desk or already gone.

Does daylight saving change AST to MSK?

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.

Moscow Time does not move its clocks at all, so its UTC+3 offset holds every day of the year.

Because the two sides do not move together, the answer to this conversion changes during the year. For part of the year the gap is 6 hours and for the rest it is 7 hours. The table above is built for today, not for an average day.

Is AST ahead of or behind MSK?

AST is behind MSK by 6 hours: when it is 12:00 pm in Atlantic, it is 6:00 pm in Moscow. 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 msk" they nearly always mean the zone rather than the literal winter offset, so this page resolves AST to America/Halifax and MSK to Europe/Moscow and applies whichever offset is genuinely in force on the day.

Atlantic Time covers Halifax, Moncton and the Canadian Maritimes. Moscow Time covers Moscow and western Russia, fixed since 2014. The identifiers behind them are America/Halifax and Europe/Moscow, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.

Questions

What is AST in MSK?

AST is 6 hours behind MSK. 9:00 am AST is 3:00 pm MSK.

How many hours ahead is MSK of AST?

MSK is 6 hours ahead of AST. That varies across the year, between 6 hours and 7 hours.

What time is it in Moscow right now?

6:21 am MSK on Friday, September 25, 2026.

When can Atlantic and Moscow meet during working hours?

Between 9:00 am and 11:00 am AST, which is 3:00 pm to 5:00 pm MSK.

Does this account for daylight saving?

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

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