GST to AST Converter
AST is 8 hours behind GST. 9:00 AM GST = 1:00 AM AST.
AST is 8 hours behind GST at the moment. To convert GST to AST, subtract 8 hours from the GST time: 9:00 AM GST = 1:00 AM AST.
GST (Gulf Time) is used in United Arab Emirates and Oman. AST (Atlantic Time) is used in Nova Scotia, New Brunswick, PEI; Puerto Rico and the Eastern Caribbean (all year).
AST here is Atlantic Standard Time, not Arabia Standard Time.
GST to AST time conversion table
GST to AST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| GST | AST | Day |
|---|---|---|
| 12:00 AM GST | 4:00 PM AST | previous day |
| 1:00 AM GST | 5:00 PM AST | previous day |
| 2:00 AM GST | 6:00 PM AST | previous day |
| 3:00 AM GST | 7:00 PM AST | previous day |
| 4:00 AM GST | 8:00 PM AST | previous day |
| 5:00 AM GST | 9:00 PM AST | previous day |
| 6:00 AM GST | 10:00 PM AST | previous day |
| 7:00 AM GST | 11:00 PM AST | previous day |
| 8:00 AM GST | 12:00 AM AST | night |
| 9:00 AM GST | 1:00 AM AST | night |
| 10:00 AM GST | 2:00 AM AST | night |
| 11:00 AM GST | 3:00 AM AST | night |
| 12:00 PM GST | 4:00 AM AST | night |
| 1:00 PM GST | 5:00 AM AST | night |
| 2:00 PM GST | 6:00 AM AST | — |
| 3:00 PM GST | 7:00 AM AST | — |
| 4:00 PM GST | 8:00 AM AST | — |
| 5:00 PM GST | 9:00 AM AST | — |
| 6:00 PM GST | 10:00 AM AST | — |
| 7:00 PM GST | 11:00 AM AST | — |
| 8:00 PM GST | 12:00 PM AST | — |
| 9:00 PM GST | 1:00 PM AST | — |
| 10:00 PM GST | 2:00 PM AST | — |
| 11:00 PM GST | 3:00 PM AST | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert GST to AST
Subtract 8 hours from the GST time to get AST.
Example: 9:00 AM GST = 1:00 AM AST.
Across midnight: 1:00 AM GST = 5:00 PM AST (previous day). The date changes, so always check the day as well as the hour.
Time difference between GST and AST
The time difference between GST and AST 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:
- 1 Jan 2026 – 7 Mar 2026: AST is 8 hours behind of GST.
- 8 Mar 2026 – 31 Oct 2026: AST is 7 hours behind of GST.
- 1 Nov 2026 – 31 Dec 2026: AST is 8 hours behind of GST.
GST and AST during daylight saving time
- GST does not observe daylight saving time; it stays on UTC+4 all year.
- 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).
Best time for a meeting between GST and AST
GST and AST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 3:00 PM GST, which is 7:00 AM AST.
GST to AST FAQ
What is the time difference between GST and AST?
Right now AST is 8 hours behind GST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM GST in AST?
9:00 AM GST is 1:00 AM AST.
What is 12 PM (noon) GST in AST?
12:00 PM GST is 4:00 AM AST.
Is AST ahead of or behind GST?
AST is 8 hours behind GST, so it is earlier in AST than in GST.
Does GST change for daylight saving time?
No. GST stays on the same offset all year, so conversions never shift for daylight saving time.
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.
What is the best time for a meeting between GST and AST?
GST and AST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 3:00 PM GST, which is 7:00 AM AST.
Related conversions
Convert AST to GST
Convert GST to other time zones
Convert other time zones to AST
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.