GMT to HST Time Converter
About this conversion
HST is Hawaii Standard Time (UTC-10). Hawaii does not use daylight saving, so HST applies all year, ten hours behind GMT and eleven hours behind BST.
When the time difference changes
Both sides keep a fixed offset, so the gap does not change in the next two years.
Best time to call or meet
GMT and HST have no shared 09:00 to 17:00 working hours at present.
Common times
- 06:00 GMT = 20:00 HST (previous day)
- 09:00 GMT = 23:00 HST (previous day)
- 12:00 GMT = 02:00 HST
- 15:00 GMT = 05:00 HST
- 17:00 GMT = 07:00 HST
- 20:00 GMT = 10:00 HST
GMT to HST hour-by-hour table
Highlighted rows fall within 09:00 to 17:00 on both sides.
| GMT | HST |
|---|---|
| 00:00 | 14:00 (previous day) |
| 01:00 | 15:00 (previous day) |
| 02:00 | 16:00 (previous day) |
| 03:00 | 17:00 (previous day) |
| 04:00 | 18:00 (previous day) |
| 05:00 | 19:00 (previous day) |
| 06:00 | 20:00 (previous day) |
| 07:00 | 21:00 (previous day) |
| 08:00 | 22:00 (previous day) |
| 09:00 | 23:00 (previous 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 |
Related conversions
Clock change guides
- What Is Daylight Saving Time (DST)? A Plain-English GuideWhat daylight saving time is, how it works in the UK, Europe and the US, why it exists, its history, who uses it and the argument over scrapping it.
- Why Do the Clocks Go Back in October? The Real ReasonThe clocks go back in autumn to return the UK to GMT, so winter mornings are lighter. The history, the rule, what time it happens and what changes for you.
- When Do the Clocks Go Forward Again After Going Back?When the UK clocks go forward again after the autumn change, how long the UK stays on GMT, when evenings get lighter and how to remember to reset your clocks.
Frequently asked questions
What is 15:00 GMT in HST?
15:00 GMT is 05:00 HST at the moment. The answer can change by an hour when either side changes its clocks.
What are the shared working hours for GMT and HST?
GMT and HST have no shared 09:00 to 17:00 working hours at present.
When does the GMT to HST time difference change?
It does not change in the next two years.