Time in GMT and AST
The time difference between Greenwich Mean Time (GMT) and Atlantic Standard Time (AST) is 4 hours. Atlantic Standard Time is 4 hours behind Greenwich Mean Time.
This means 9am GMT is 5am AST and 5pm GMT is 1pm AST.
Greenwich Mean Time
- The current local time in GMT is 11:41 am (July 18, 2026)
- GMT time zone offset is UTC+00:00
Atlantic Standard Time
- The current local time in AST is 3:41 pm (July 18, 2026)
- AST time zone offset is UTC-04:00
How to convert Greenwich Mean Time to Atlantic Standard Time?
Subtract 4 hours from Greenwich Mean Time to get Atlantic Standard Time.
Time in GMT
00:00
Time in AST
00:00
Use the slider above to convert Greenwich Mean Time to Atlantic Standard Time and view the day and night map at different times.
Day–night colors on the map:
Day
Civil twilight
Nautical twilight
Astronomical twilight
NightTime Conversion Chart
| GMT | AST |
|---|---|
| 12am | 8pm |
| 1am | 9pm |
| 2am | 10pm |
| 3am | 11pm |
| 4am | 12am |
| 5am | 1am |
| 6am | 2am |
| 7am | 3am |
| 8am | 4am |
| 9am | 5am |
| 10am | 6am |
| 11am | 7am |
| 12pm | 8am |
| 1pm | 9am |
| 2pm | 10am |
| 3pm | 11am |
| 4pm | 12pm |
| 5pm | 1pm |
| 6pm | 2pm |
| 7pm | 3pm |
| 8pm | 4pm |
| 9pm | 5pm |
| 10pm | 6pm |
| 11pm | 7pm |