GMT to AST Converter
AST is 4 hours behind of GMT.
GMT
Wednesday, October 28, 2026
Greenwich Mean Time · UTC+0
AST
Wednesday, October 28, 2026
Atlantic Standard Time · UTC−4
Convert GMT to AST
GMT 14:56 = AST 10:56
GMT to AST time chart, hour by hour
| GMT | AST |
|---|
| 00:00 | 20:00 −1 day |
| 01:00 | 21:00 −1 day |
| 02:00 | 22:00 −1 day |
| 03:00 | 23:00 −1 day |
| 04:00 | 00:00 |
| 05:00 | 01:00 |
| 06:00 | 02:00 |
| 07:00 | 03:00 |
| 08:00 | 04:00 |
| 09:00 | 05:00 |
| 10:00 | 06:00 |
| 11:00 | 07:00 |
| 12:00 | 08:00 |
| 13:00 | 09:00 |
| 14:00 | 10:00 |
| 15:00 | 11:00 |
| 16:00 | 12:00 |
| 17:00 | 13:00 |
| 18:00 | 14:00 |
| 19:00 | 15:00 |
| 20:00 | 16:00 |
| 21:00 | 17:00 |
| 22:00 | 18:00 |
| 23:00 | 19:00 |
Highlighted rows fall within 09:00–18:00 in both places: 5 shared working hours.
How many hours is GMT ahead of AST?
As abbreviations, AST is always 4 hours behind of GMT: GMT is UTC+0 and AST is UTC−4. To convert, subtract 4 hours.
Does the GMT to AST time difference change?
No. Ast is 4 hours behind of gmt all year, because neither place changes its clocks.
When GMT and AST are both at work
- When AST is 4 hours behind of GMT: 4 shared office hours, 13:00 to 17:00 in GMT (09:00 to 13:00 in AST).
Frequently asked questions about GMT and AST time
How many hours ahead is AST of GMT?
AST (UTC−4) is 4 hours behind of GMT (UTC+0).
Does the time difference between GMT and AST change during the year?
No, it stays 4 hours behind all year because neither place changes its clocks.