GMT to HST: GMT is 10 hours ahead of HST
Greenwich Mean Time is 10 hours ahead of Hawaii Standard Time, on every day of the year. It is 10:09 am GMT in GMT and 12:09 am HST in Hawaii.
Convert a specific time from GMT to HST
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 GMT and HST?
Hawaii Standard Time is 10 hours behind Greenwich Mean Time. To go from GMT to HST you subtract 10 hours. That gap holds on all 365 days of 2026: neither zone moves its clocks.
GMT to HST conversion table
Every hour of Friday, September 25, 2026 in GMT, with the matching reading in Hawaii. 10 of the 24 hours land on a different calendar date in Hawaii, which is the part people get wrong when they schedule across this pair.
| GMT | GMT 24h | HST | HST 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 2:00 pm | 14:00 | the previous day |
| 1:00 am | 01:00 | 3:00 pm | 15:00 | the previous day |
| 2:00 am | 02:00 | 4:00 pm | 16:00 | the previous day |
| 3:00 am | 03:00 | 5:00 pm | 17:00 | the previous day |
| 4:00 am | 04:00 | 6:00 pm | 18:00 | the previous day |
| 5:00 am | 05:00 | 7:00 pm | 19:00 | the previous day |
| 6:00 am | 06:00 | 8:00 pm | 20:00 | the previous day |
| 7:00 am | 07:00 | 9:00 pm | 21:00 | the previous day |
| 8:00 am | 08:00 | 10:00 pm | 22:00 | the previous day |
| 9:00 am | 09:00 | 11:00 pm | 23:00 | the previous day |
| 10:00 am | 10:00 | 12:00 am | 00:00 | same day |
| 11:00 am | 11:00 | 1:00 am | 01:00 | same day |
| 12:00 pm | 12:00 | 2:00 am | 02:00 | same day |
| 1:00 pm | 13:00 | 3:00 am | 03:00 | same day |
| 2:00 pm | 14:00 | 4:00 am | 04:00 | same day |
| 3:00 pm | 15:00 | 5:00 am | 05:00 | same day |
| 4:00 pm | 16:00 | 6:00 am | 06:00 | same day |
| 5:00 pm | 17:00 | 7:00 am | 07:00 | same day |
| 6:00 pm | 18:00 | 8:00 am | 08:00 | same day |
| 7:00 pm | 19:00 | 9:00 am | 09:00 | same day |
| 8:00 pm | 20:00 | 10:00 am | 10:00 | same day |
| 9:00 pm | 21:00 | 11:00 am | 11:00 | same day |
| 10:00 pm | 22:00 | 12:00 pm | 12:00 | same day |
| 11:00 pm | 23:00 | 1:00 pm | 13:00 | same day |
What are the best hours to schedule a call between GMT and HST?
No hour of the standard 9:00 am to 5:00 pm working day falls inside working hours on both sides. GMT and Hawaii 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.
| GMT | HST | Working hours | Note |
|---|---|---|---|
| 5:00 pm | 7:00 am | neither side | evening in GMT, early morning in Hawaii |
| 6:00 pm | 8:00 am | neither side | evening in GMT, mid morning in Hawaii |
| 7:00 pm | 9:00 am | HST only | evening in GMT, mid morning in Hawaii |
Does daylight saving change GMT to HST?
Greenwich Mean Time does not move its clocks at all, so its UTC+0 offset holds every day of the year.
Hawaii Standard Time does not move its clocks at all, so its UTC-10 offset holds every day of the year.
Is GMT ahead of or behind HST?
GMT is ahead of HST by 10 hours: when it is 12:00 pm in GMT, it is 2:00 am in Hawaii. Neither Greenwich Mean Time nor Hawaii Standard Time observes daylight saving, so the abbreviations never change and the gap between them is fixed.
Greenwich Mean Time covers identical to UTC as a clock reading, and a separate thing as a standard. Hawaii Standard Time covers Hawaii, which has never moved its clocks. The identifiers behind them are Etc/GMT and Pacific/Honolulu, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is GMT in HST?
- GMT is 10 hours ahead of HST. 9:00 am GMT is 11:00 pm the previous day HST.
- How many hours ahead is HST of GMT?
- HST is 10 hours behind GMT.
- What time is it in Hawaii right now?
- 12:09 am HST on Friday, September 25, 2026.
- When can GMT and Hawaii meet during working hours?
- There is no shared working hour. The closest fit is 5:00 pm GMT, which is 7:00 am HST.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so GMT and HST are the abbreviations genuinely in force today rather than a fixed assumption.
Other conversions
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