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

AST is currently 3 hours behind 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).

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.

Around January AST is 4 hours behind GMT. Around July it is 3 hours behind GMT. 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 AST ahead of or behind GMT right now?

AST is currently 3 hours behind GMT.

What is the current GMT to AST time difference?

Right now the gap is 3 hours — AST is 3 hours behind GMT.

Does the GMT → AST offset change during the year?

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

Does GMT observe daylight saving time?

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

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).

What time is 3 AM GMT in AST?

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

What time is 8 AM GMT in AST?

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

What time is 9 AM GMT in AST?

9:00 AM GMT is 6:00 AM AST.

What time is 10 AM GMT in AST?

10:00 AM GMT is 7:00 AM AST.

What time is 11 AM GMT in AST?

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

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

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

What time is 2 PM GMT in AST?

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

What time is 3 PM GMT in AST?

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

What time is 4 PM GMT in AST?

4:00 PM GMT is 1:00 PM AST.

What time is 5 PM GMT in AST?

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

What time is 9 PM GMT in AST?

9:00 PM GMT is 6:00 PM AST.

What time is 10 PM GMT in AST?

10:00 PM GMT is 7:00 PM AST.

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

The working-hours overlap (09:00–17:00 in both zones) runs roughly 12:00 PM – 5:00 PM GMT (≈ 5 hours). The midpoint of that window — 2:30 PM GMT, 11:30 AM AST — is the safest single slot to propose for a live call.

What time zone does GMT refer to?

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

What time zone does AST refer to?

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

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).

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.

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

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