Hawaii Time to Greenwich Mean Time
Convert times between Hawaii Time (HST, UTC-10:00) and Greenwich Mean Time (GMT, UTC+0:00). Greenwich Mean Time is 10 hours ahead of Hawaii Time in standard time. During daylight saving time this difference changes to 11 hours.
UTC-10:00→UTC+0:00 / +1:00
Live timezone converterUTC Offset Reference
| Timezone | Abbreviation | Standard offset | DST offset | Country |
|---|---|---|---|---|
| Hawaii Time | HST | UTC-10:00 | — | United States |
| Greenwich Mean Time | GMT / BST | UTC+0:00 | UTC+1:00 | United Kingdom |
* DST offset applies during summer months. Exact transition dates vary by year.
Standard Time Conversion (HST → GMT)
| Hawaii Time | Greenwich Mean Time |
|---|---|
| 12:00 AM HST | 10:00 AM GMT |
| 6:00 AM HST | 4:00 PM GMT |
| 9:00 AM HST | 7:00 PM GMT |
| 12:00 PM HST | 10:00 PM GMT |
| 3:00 PM HST | 1:00 AM (next day) GMT |
| 6:00 PM HST | 4:00 AM (next day) GMT |
| 9:00 PM HST | 7:00 AM (next day) GMT |
Summer (DST) Conversion (HST → BST)
| Hawaii Time (summer) | Greenwich Mean Time (summer) |
|---|---|
| 12:00 AM HST | 11:00 AM BST |
| 6:00 AM HST | 5:00 PM BST |
| 9:00 AM HST | 8:00 PM BST |
| 12:00 PM HST | 11:00 PM BST |
| 3:00 PM HST | 2:00 AM (next day) BST |
| 6:00 PM HST | 5:00 AM (next day) BST |
| 9:00 PM HST | 8:00 AM (next day) BST |
Daylight Saving Time (DST) Notes
- Greenwich Mean Time observes DST. Clocks advance 1 hour to BST (UTC+1:00) roughly from month 3 to 10.
- The offset difference shifts between 10h (standard) and 11h (DST season). Always verify the current offset using the live converter below.
Frequently Asked Questions
How do I convert HST to GMT?
Add 10 hours to the HST time to get GMT. For example, 9:00 AM HST = 7:00 PM GMT.
What is the current UTC offset for Hawaii Time?
Hawaii Time is always UTC-10:00 (HST) — it does not observe DST.
Is Greenwich Mean Time ahead or behind Hawaii Time?
Greenwich Mean Time is 10 hours ahead of Hawaii Time in standard time.
When is a good time to schedule a meeting between HST and GMT?
Due to the 10-hour difference, business-hours overlap may be limited. Use the live timezone converter to find a mutually convenient time.
Related Timezone Conversions
Hawaii Time → US Eastern TimeHST / ESTHawaii Time → US Central TimeHST / CSTHawaii Time → US Mountain TimeHST / MSTHawaii Time → US Pacific TimeHST / PSTHawaii Time → US Alaska TimeHST / AKSTHawaii Time → Canada Atlantic TimeHST / ASTHawaii Time → Central European TimeHST / CETHawaii Time → Eastern European TimeHST / EET
Need the exact current time?
Use the live ToolsHub timezone converter to see current times, DST status, and schedule across time zones.