GMT to HST Converter
HST is 10 hours behind of GMT.
GMT
Thursday, October 1, 2026
Greenwich Mean Time · UTC+0
HST
Thursday, October 1, 2026
Hawaii Standard Time · UTC−10
Convert GMT to HST
GMT 18:54 = HST 08:54
GMT to HST time chart, hour by hour
| GMT | HST |
|---|
| 00:00 | 14:00 −1 day |
| 01:00 | 15:00 −1 day |
| 02:00 | 16:00 −1 day |
| 03:00 | 17:00 −1 day |
| 04:00 | 18:00 −1 day |
| 05:00 | 19:00 −1 day |
| 06:00 | 20:00 −1 day |
| 07:00 | 21:00 −1 day |
| 08:00 | 22:00 −1 day |
| 09:00 | 23:00 −1 day |
| 10:00 | 00:00 |
| 11:00 | 01:00 |
| 12:00 | 02:00 |
| 13:00 | 03:00 |
| 14:00 | 04:00 |
| 15:00 | 05:00 |
| 16:00 | 06:00 |
| 17:00 | 07:00 |
| 18:00 | 08:00 |
| 19:00 | 09:00 |
| 20:00 | 10:00 |
| 21:00 | 11:00 |
| 22:00 | 12:00 |
| 23:00 | 13:00 |
There is no overlap between 09:00–18:00 working days in these two places.
How many hours is GMT ahead of HST?
As abbreviations, HST is always 10 hours behind of GMT: GMT is UTC+0 and HST is UTC−10. To convert, subtract 10 hours.
Does the GMT to HST time difference change?
No. Hst is 10 hours behind of gmt all year, because neither place changes its clocks.
When GMT and HST are both at work
- When HST is 10 hours behind of GMT: no shared 09:00 to 17:00 hours; try 17:00 in GMT (07:00 in HST).
Frequently asked questions about GMT and HST time
How many hours ahead is HST of GMT?
HST (UTC−10) is 10 hours behind of GMT (UTC+0).
Does the time difference between GMT and HST change during the year?
No, it stays 10 hours behind all year because neither place changes its clocks.