AST to GMT Time — Convert Atlantic Standard Time to Greenwich Mean Time

GMT is currently 3 hours ahead of AST.

On Clockjumper, AST refers to Atlantic Standard Time in Atlantic Canada and the Caribbean (UTC−4). The same letters are also used for Arabia Standard Time (UTC+3) — check the city or UTC offset to be sure which is meant.

GMT is equivalent to UTC for everyday use. In the UK it also refers to the winter (non-daylight-saving) time; in summer the UK moves to BST (UTC+1).

Around January GMT is 4 hours ahead of AST. Around July it is 3 hours ahead of AST. That swing comes from one or both zones observing daylight saving on different schedules — the converter above always reflects the correct offset for the date you pick.

Is GMT ahead of or behind AST right now?

GMT is currently 3 hours ahead of AST.

What is the current AST to GMT time difference?

Right now the gap is 3 hours — GMT is 3 hours ahead of AST.

Does the AST → GMT offset change during the year?

Yes. Around January GMT is 4 hours ahead of AST; around July it is 3 hours ahead of AST. The converter above always reflects the correct offset for the date you pick.

Does AST observe daylight saving time?

AST is itself the standard-time form. Atlantic Standard Time is in force at UTC-4 through the winter months; outside that window the same zone is on ADT (UTC-3).

Does GMT observe daylight saving time?

No — Greenwich Mean Time stays at a fixed UTC offset year-round.

What time is 3 AM AST in GMT?

3:00 AM AST is 6:00 AM GMT.

What time is 8 AM AST in GMT?

8:00 AM AST is 11:00 AM GMT.

What time is 9 AM AST in GMT?

9:00 AM AST is 12:00 PM GMT.

What time is 10 AM AST in GMT?

10:00 AM AST is 1:00 PM GMT.

What time is 11 AM AST in GMT?

11:00 AM AST is 2:00 PM GMT.

What time is 12 PM (noon) AST in GMT?

12:00 PM AST is 3:00 PM GMT.

What time is 2 PM AST in GMT?

2:00 PM AST is 5:00 PM GMT.

What time is 3 PM AST in GMT?

3:00 PM AST is 6:00 PM GMT.

What time is 4 PM AST in GMT?

4:00 PM AST is 7:00 PM GMT.

What time is 5 PM AST in GMT?

5:00 PM AST is 8:00 PM GMT.

What time is 9 PM AST in GMT?

9:00 PM AST is 12:00 AM (next day) GMT.

What time is 10 PM AST in GMT?

10:00 PM AST is 1:00 AM (next day) GMT.

When is the best time to schedule a call between AST and GMT?

The working-hours overlap (09:00–17:00 in both zones) runs roughly 9:00 AM – 2:00 PM AST (≈ 5 hours). The midpoint of that window — 11:30 AM AST, 2:30 PM GMT — is the safest single slot to propose for a live call.

What time zone does AST refer to?

AST refers to Atlantic Standard Time (IANA: America/Halifax).

What time zone does GMT refer to?

GMT refers to Greenwich Mean Time (IANA: UTC).

Is AST on this page the same as other zones that share the letters "AST"?

On Clockjumper, AST refers to Atlantic Standard Time in Atlantic Canada and the Caribbean (UTC−4). The same letters are also used for Arabia Standard Time (UTC+3) — check the city or UTC offset to be sure which is meant.

Is GMT on this page the same as other zones that share the letters "GMT"?

GMT is equivalent to UTC for everyday use. In the UK it also refers to the winter (non-daylight-saving) time; in summer the UK moves to BST (UTC+1).

• GMT to AST
• AST to CST
• AEDT to GMT
• AST to EST
• AEST to GMT
• AST to IST
• BST to GMT
• AST to MST
• CDT to GMT
• AST to PST
• CET to GMT
• CST to AST
• CST to GMT
• EST to AST
• EDT to GMT

• About AST (Atlantic Standard Time) →
• About GMT (Greenwich Mean Time) →
• All timezone conversion pages →
• Research: how daylight saving shifts workday overlap →