AST to GMT Converter
GMT is 4 hours ahead of AST. 9:00 AM AST = 1:00 PM GMT.
GMT is 4 hours ahead of AST at the moment. To convert AST to GMT, add 4 hours to the AST time: 9:00 AM AST = 1:00 PM GMT.
AST (Atlantic Time) is used in Nova Scotia, New Brunswick, PEI; Puerto Rico and the Eastern Caribbean (all year). GMT (GMT) is used in Same offset as UTC. The UK and Ireland use GMT in winter; Iceland, Ghana and Senegal all year.
AST here is Atlantic Standard Time, not Arabia Standard Time. The UK is on GMT only in winter; in summer it uses BST (UTC+1).
AST to GMT time conversion table
AST to GMT on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| AST | GMT | Day |
|---|---|---|
| 12:00 AM AST | 4:00 AM GMT | night |
| 1:00 AM AST | 5:00 AM GMT | night |
| 2:00 AM AST | 6:00 AM GMT | — |
| 3:00 AM AST | 7:00 AM GMT | — |
| 4:00 AM AST | 8:00 AM GMT | — |
| 5:00 AM AST | 9:00 AM GMT | — |
| 6:00 AM AST | 10:00 AM GMT | — |
| 7:00 AM AST | 11:00 AM GMT | — |
| 8:00 AM AST | 12:00 PM GMT | — |
| 9:00 AM AST | 1:00 PM GMT | work hours |
| 10:00 AM AST | 2:00 PM GMT | work hours |
| 11:00 AM AST | 3:00 PM GMT | work hours |
| 12:00 PM AST | 4:00 PM GMT | work hours |
| 1:00 PM AST | 5:00 PM GMT | — |
| 2:00 PM AST | 6:00 PM GMT | — |
| 3:00 PM AST | 7:00 PM GMT | — |
| 4:00 PM AST | 8:00 PM GMT | — |
| 5:00 PM AST | 9:00 PM GMT | — |
| 6:00 PM AST | 10:00 PM GMT | night |
| 7:00 PM AST | 11:00 PM GMT | night |
| 8:00 PM AST | 12:00 AM GMT | next day |
| 9:00 PM AST | 1:00 AM GMT | next day |
| 10:00 PM AST | 2:00 AM GMT | next day |
| 11:00 PM AST | 3:00 AM GMT | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert AST to GMT
Add 4 hours to the AST time to get GMT.
Example: 9:00 AM AST = 1:00 PM GMT.
Across midnight: 10:00 PM AST = 2:00 AM GMT (next day). The date changes, so always check the day as well as the hour.
Time difference between AST and GMT
The time difference between AST and GMT is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 31 Dec 2025 – 7 Mar 2026: GMT is 4 hours ahead of AST.
- 8 Mar 2026 – 31 Oct 2026: GMT is 3 hours ahead of AST.
- 1 Nov 2026 – 30 Dec 2026: GMT is 4 hours ahead of AST.
AST and GMT during daylight saving time
- AST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from AST (UTC−4) to ADT (UTC−3).
- GMT does not observe daylight saving time; it stays on UTC+0 all year.
Best time for a meeting between AST and GMT
AST and GMT share 4 hours of the 9 AM–5 PM working day. Any time between 9:00 AM and 1:00 PM AST lands between 1:00 PM and 5:00 PM GMT, inside working hours for both.
AST to GMT FAQ
What is the time difference between AST and GMT?
Right now GMT is 4 hours ahead of AST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM AST in GMT?
9:00 AM AST is 1:00 PM GMT.
What is 12 PM (noon) AST in GMT?
12:00 PM AST is 4:00 PM GMT.
Is GMT ahead of or behind AST?
GMT is 4 hours ahead of AST, so it is later in GMT than in AST.
Does AST change for daylight saving time?
Yes. AST next changes on 14 Mar 2027, when clocks go forward one hour from AST to ADT.
Does GMT change for daylight saving time?
No. GMT stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between AST and GMT?
AST and GMT share 4 hours of the 9 AM–5 PM working day. Any time between 9:00 AM and 1:00 PM AST lands between 1:00 PM and 5:00 PM GMT, inside working hours for both.
Related conversions
Convert GMT to AST
Convert AST to other time zones
Convert other time zones to GMT
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.