HST to GMT converter
GMT is 10 hours ahead of HST right now. Live clocks on both sides, a direct time input, the full 24-hour table with a permalink per hour, and the real daylight-saving state — computed from the IANA tz database on every request, never from a stored offset.
Convert an exact time type it — no sliders
Conversion runs in your browser against the same IANA rules the server uses, so it keeps working offline and nothing you type is sent anywhere.
Daylight saving right now
Greenwich Mean Time
Etc/GMT is currently on GMT (UTC+00:00).
no clock change scheduled — this zone is fixed at UTC+00:00
GMT is UTC+0 and never shifts. The UK observes GMT in winter only — in summer it is on BST (UTC+1), so "GMT" on a British invite dated in July usually means BST.
Hawaii Standard Time
Pacific/Honolulu is on HST (UTC-10:00).
no clock change scheduled — fixed at UTC-10:00
Hawaii Standard Time is UTC-10 all year — Hawaii opted out of daylight saving in 1967, so the offset never moves.
Best time to call green = 09:00–18:00 on both sides
No overlap inside a 09:00–18:00 day on both sides. Someone has to take an early or late slot — the table below shows exactly which hours are least bad.
HST to GMT, hour by hour 12 August 2026 · every row is a permalink
| HST | GMT | 12-hour | Day | Permalink |
|---|---|---|---|---|
| 00:00 | 10:00 GMT | 10:00 AM | same day | 00:00 → |
| 01:00 | 11:00 GMT | 11:00 AM | same day | 01:00 → |
| 02:00 | 12:00 GMT | 12:00 PM | same day | 02:00 → |
| 03:00 | 13:00 GMT | 1:00 PM | same day | 03:00 → |
| 04:00 | 14:00 GMT | 2:00 PM | same day | 04:00 → |
| 05:00 | 15:00 GMT | 3:00 PM | same day | 05:00 → |
| 06:00 | 16:00 GMT | 4:00 PM | same day | 06:00 → |
| 07:00 | 17:00 GMT | 5:00 PM | same day | 07:00 → |
| 08:00 | 18:00 GMT | 6:00 PM | same day | 08:00 → |
| 09:00 | 19:00 GMT | 7:00 PM | same day | 09:00 → |
| 10:00 | 20:00 GMT | 8:00 PM | same day | 10:00 → |
| 11:00 | 21:00 GMT | 9:00 PM | same day | 11:00 → |
| 12:00 | 22:00 GMT | 10:00 PM | same day | 12:00 → |
| 13:00 | 23:00 GMT | 11:00 PM | same day | 13:00 → |
| 14:00 | 00:00 GMT | 12:00 AM | next day | 14:00 → |
| 15:00 | 01:00 GMT | 1:00 AM | next day | 15:00 → |
| 16:00 | 02:00 GMT | 2:00 AM | next day | 16:00 → |
| 17:00 | 03:00 GMT | 3:00 AM | next day | 17:00 → |
| 18:00 | 04:00 GMT | 4:00 AM | next day | 18:00 → |
| 19:00 | 05:00 GMT | 5:00 AM | next day | 19:00 → |
| 20:00 | 06:00 GMT | 6:00 AM | next day | 20:00 → |
| 21:00 | 07:00 GMT | 7:00 AM | next day | 21:00 → |
| 22:00 | 08:00 GMT | 8:00 AM | next day | 22:00 → |
| 23:00 | 09:00 GMT | 9:00 AM | next day | 23:00 → |