AST to MSK
+7hAST
ASTSOURCEMSK
MSKGreen rows indicate typical business hours (9 AM - 5 PM)
AST and MSK on the World Map
The map below highlights the AST (Atlantic Standard Time) and MSK (Moscow Standard Time) timezone regions across the globe.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •Puerto Rico uses AST year-round and does not observe DST.
- •AST is 1 hour ahead of EST.
- •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
MSK – Moscow Standard Time
UTC+03:00Moscow Standard Time (MSK) is the time zone for Moscow and western Russia, 3 hours ahead of UTC.
- •All Russian train timetables use Moscow Time, regardless of location.
- •Russia abolished daylight saving time in 2011.
- •Moscow is the most populous city in Europe with over 12 million residents.
- •MSK shares the offset with Saudi Arabia (AST) and East Africa (EAT).
Comparing Time Zones: AST and MSK
AST runs on Atlantic Standard Time (AST) at UTC-04:00. MSK runs on Moscow Standard Time (MSK) at UTC+03:00. That puts AST 7 hours ahead of MSK — a difference of +7h at the current offsets.
In practice, when it is 9:00 AM in AST it is 4:00 PM in MSK. Midnight in AST is 7:00 AM in MSK. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to MSK time conversion table
| AST (AST) | MSK (MSK) | Day |
|---|---|---|
| 12:00 AM | 7:00 AM | same day |
| 6:00 AM | 1:00 PM | same day |
| 7:00 AM | 2:00 PM | same day |
| 8:00 AM | 3:00 PM | same day |
| 9:00 AM | 4:00 PM | same day |
| 12:00 PM | 7:00 PM | same day |
| 3:00 PM | 10:00 PM | same day |
| 5:00 PM | 12:00 AM | next day |
| 6:00 PM | 1:00 AM | next day |
| 9:00 PM | 4:00 AM | next day |
Why people convert AST to MSK time
- Scheduling a call from AST to MSK: a 10:00 AM start in AST lands at 5:00 PM in MSK, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and MSK are inside the 9-to-5 working day between 9:00 AM and 10:00 AM AST time (4:00 PM–5:00 PM MSK). That is roughly 1 hours of usable overlap.
- Watching a live event or market open: AST viewers need 4:00 PM in MSK to catch a 9:00 AM start there, and 5:00 PM if the event is anchored to AST.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +7h gap is not.
- Block 9:00 AM–10:00 AM AST as the recurring meeting window if you work primarily from AST and need MSK colleagues present.
About AST (Atlantic Standard Time)
Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.
About MSK (Moscow Standard Time)
Moscow Standard Time (MSK) is the time zone used in Moscow, St. Petersburg, and much of western Russia. Russia abolished DST in 2011, so MSK is observed year-round. MSK is also the reference time for Russian railways – all train schedules in Russia are given in Moscow Time regardless of the actual local time zone.
Best time to call between AST and MSK
Both AST and MSK sit inside the 9 AM – 5 PM working day between 9:00 AM–10:00 AM AST, which is 4:00 PM–5:00 PM MSK. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and MSK overlap for only 60 minutes (9:00 AM–10:00 AM AST), so meetings have to be booked precisely.
AST is 7 hours ahead of MSK (AST UTC-04:00 → MSK UTC+03:00). The shared working window is 9:00 AM–10:00 AM AST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
MSK
Does not observe DST
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between AST and MSK?
AST (AST, UTC-04:00) is 7 hours ahead of MSK (MSK, UTC+03:00). The gap is currently +7h.
How do I convert AST time to MSK time?
Add +7h to AST local time. For example, 9:00 AM in AST is 4:00 PM in MSK.
What time is it in MSK right now?
MSK uses MSK at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +7h offset from AST.
What is the best time to call MSK from AST?
Call between 9:00 AM and 10:00 AM AST — that maps to 4:00 PM–5:00 PM MSK and keeps both parties inside the working day.
Which is ahead, AST or MSK?
AST is 7 hours ahead of MSK. When it is 12:00 PM in AST it is 7:00 PM in MSK.
Does daylight saving time affect the AST–MSK difference?
Neither zone observes daylight saving time, so the +7h offset between AST and MSK is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and MSK?
Not normally. The +7h gap only pushes the date over for late-evening times.
What is the time difference between AST and MSK?
MSK is +7h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is MSK in?
MSK operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
Which cities are in the MSK timezone?
Major cities in the MSK timezone include Moscow, St. Petersburg, Volgograd, Nizhny Novgorod, Kazan, Samara, Rostov-on-Don.
What is the UTC offset for MSK?
Moscow Standard Time (MSK) is at UTC+03:00.
What should I know about the MSK timezone?
All Russian train timetables use Moscow Time, regardless of location. Russia abolished daylight saving time in 2011.
When is it midnight in AST, what time is it in MSK?
When it is 12:00 AM (midnight) in AST (AST), it is +7h later in MSK (MSK).
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See every conversion from AST →·See every conversion from MSK →