Time in IST and GMT
The time difference between Irish Standard Time (IST) and Greenwich Mean Time (GMT) is 1 hour. Greenwich Mean Time is 1 hour behind Irish Standard Time.
This means 9am IST is 8am GMT and 5pm IST is 4pm GMT.
Irish Standard Time
- The current local time in IST is 2:37 pm (July 18, 2026)
- IST time zone offset is UTC+01:00
Greenwich Mean Time
- The current local time in GMT is 1:37 pm (July 18, 2026)
- GMT time zone offset is UTC+00:00
How to convert Irish Standard Time to Greenwich Mean Time?
Subtract 1 hour from Irish Standard Time to get Greenwich Mean Time.
Time in IST
00:00
Time in GMT
00:00
Use the slider above to convert Irish Standard Time to Greenwich Mean 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
| IST | GMT |
|---|---|
| 12am | 11pm |
| 1am | 12am |
| 2am | 1am |
| 3am | 2am |
| 4am | 3am |
| 5am | 4am |
| 6am | 5am |
| 7am | 6am |
| 8am | 7am |
| 9am | 8am |
| 10am | 9am |
| 11am | 10am |
| 12pm | 11am |
| 1pm | 12pm |
| 2pm | 1pm |
| 3pm | 2pm |
| 4pm | 3pm |
| 5pm | 4pm |
| 6pm | 5pm |
| 7pm | 6pm |
| 8pm | 7pm |
| 9pm | 8pm |
| 10pm | 9pm |
| 11pm | 10pm |