HST to GMT: HST is 10 hours behind GMT
Hawaii Standard Time is 10 hours behind Greenwich Mean Time, on every day of the year. It is 12:08 pm HST in Hawaii and 10:08 pm GMT in GMT.
Convert a specific time from HST to GMT
Pick any time and date to convert it both ways. The conversion runs in your browser against the real zone rules, so a date inside a daylight saving period gets that period's offset rather than today's.
What is the time difference between HST and GMT?
Greenwich Mean Time is 10 hours ahead of Hawaii Standard Time. To go from HST to GMT you add 10 hours. That gap holds on all 365 days of 2026: neither zone moves its clocks.
HST to GMT conversion table
Every hour of Thursday, September 24, 2026 in Hawaii, with the matching reading in GMT. 10 of the 24 hours land on a different calendar date in GMT, which is the part people get wrong when they schedule across this pair.
| HST | HST 24h | GMT | GMT 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 10:00 am | 10:00 | same day |
| 1:00 am | 01:00 | 11:00 am | 11:00 | same day |
| 2:00 am | 02:00 | 12:00 pm | 12:00 | same day |
| 3:00 am | 03:00 | 1:00 pm | 13:00 | same day |
| 4:00 am | 04:00 | 2:00 pm | 14:00 | same day |
| 5:00 am | 05:00 | 3:00 pm | 15:00 | same day |
| 6:00 am | 06:00 | 4:00 pm | 16:00 | same day |
| 7:00 am | 07:00 | 5:00 pm | 17:00 | same day |
| 8:00 am | 08:00 | 6:00 pm | 18:00 | same day |
| 9:00 am | 09:00 | 7:00 pm | 19:00 | same day |
| 10:00 am | 10:00 | 8:00 pm | 20:00 | same day |
| 11:00 am | 11:00 | 9:00 pm | 21:00 | same day |
| 12:00 pm | 12:00 | 10:00 pm | 22:00 | same day |
| 1:00 pm | 13:00 | 11:00 pm | 23:00 | same day |
| 2:00 pm | 14:00 | 12:00 am | 00:00 | the next day |
| 3:00 pm | 15:00 | 1:00 am | 01:00 | the next day |
| 4:00 pm | 16:00 | 2:00 am | 02:00 | the next day |
| 5:00 pm | 17:00 | 3:00 am | 03:00 | the next day |
| 6:00 pm | 18:00 | 4:00 am | 04:00 | the next day |
| 7:00 pm | 19:00 | 5:00 am | 05:00 | the next day |
| 8:00 pm | 20:00 | 6:00 am | 06:00 | the next day |
| 9:00 pm | 21:00 | 7:00 am | 07:00 | the next day |
| 10:00 pm | 22:00 | 8:00 am | 08:00 | the next day |
| 11:00 pm | 23:00 | 9:00 am | 09:00 | the next day |
What are the best hours to schedule a call between HST and GMT?
No hour of the standard 9:00 am to 5:00 pm working day falls inside working hours on both sides. Hawaii and GMT are 10 hours apart, which is too far for an overlap, so somebody has to take a call outside their own working day. The least painful options are below, ranked by how close both sides sit to the middle of the afternoon.
| HST | GMT | Working hours | Note |
|---|---|---|---|
| 7:00 am | 5:00 pm | neither side | early morning in Hawaii, evening in GMT |
| 8:00 am | 6:00 pm | neither side | mid morning in Hawaii, evening in GMT |
| 9:00 am | 7:00 pm | HST only | mid morning in Hawaii, evening in GMT |
Does daylight saving change HST to GMT?
Hawaii Standard Time does not move its clocks at all, so its UTC-10 offset holds every day of the year.
Greenwich Mean Time does not move its clocks at all, so its UTC+0 offset holds every day of the year.
Is HST ahead of or behind GMT?
HST is behind GMT by 10 hours: when it is 12:00 pm in Hawaii, it is 10:00 pm in GMT. Neither Hawaii Standard Time nor Greenwich Mean Time observes daylight saving, so the abbreviations never change and the gap between them is fixed.
Hawaii Standard Time covers Hawaii, which has never moved its clocks. Greenwich Mean Time covers identical to UTC as a clock reading, and a separate thing as a standard. The identifiers behind them are Pacific/Honolulu and Etc/GMT, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is HST in GMT?
- HST is 10 hours behind GMT. 9:00 am HST is 7:00 pm GMT.
- How many hours ahead is GMT of HST?
- GMT is 10 hours ahead of HST.
- What time is it in GMT right now?
- 10:08 pm GMT on Thursday, September 24, 2026.
- When can Hawaii and GMT meet during working hours?
- There is no shared working hour. The closest fit is 7:00 am HST, which is 5:00 pm GMT.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so HST and GMT are the abbreviations genuinely in force today rather than a fixed assumption.
Other conversions
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