HST to GMT Converter
GMT is 10 hours ahead of HST. 9:00 AM HST = 7:00 PM GMT.
GMT is 10 hours ahead of HST. To convert HST to GMT, add 10 hours to the HST time: 9:00 AM HST = 7:00 PM GMT.
HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time). GMT (GMT) is used in Same offset as UTC. The UK and Ireland use GMT in winter; Iceland, Ghana and Senegal all year.
The UK is on GMT only in winter; in summer it uses BST (UTC+1).
HST to GMT time conversion table
HST to GMT on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| HST | GMT | Day |
|---|---|---|
| 12:00 AM HST | 10:00 AM GMT | — |
| 1:00 AM HST | 11:00 AM GMT | — |
| 2:00 AM HST | 12:00 PM GMT | — |
| 3:00 AM HST | 1:00 PM GMT | — |
| 4:00 AM HST | 2:00 PM GMT | — |
| 5:00 AM HST | 3:00 PM GMT | — |
| 6:00 AM HST | 4:00 PM GMT | — |
| 7:00 AM HST | 5:00 PM GMT | — |
| 8:00 AM HST | 6:00 PM GMT | — |
| 9:00 AM HST | 7:00 PM GMT | — |
| 10:00 AM HST | 8:00 PM GMT | — |
| 11:00 AM HST | 9:00 PM GMT | — |
| 12:00 PM HST | 10:00 PM GMT | night |
| 1:00 PM HST | 11:00 PM GMT | night |
| 2:00 PM HST | 12:00 AM GMT | next day |
| 3:00 PM HST | 1:00 AM GMT | next day |
| 4:00 PM HST | 2:00 AM GMT | next day |
| 5:00 PM HST | 3:00 AM GMT | next day |
| 6:00 PM HST | 4:00 AM GMT | next day |
| 7:00 PM HST | 5:00 AM GMT | next day |
| 8:00 PM HST | 6:00 AM GMT | next day |
| 9:00 PM HST | 7:00 AM GMT | next day |
| 10:00 PM HST | 8:00 AM GMT | next day |
| 11:00 PM HST | 9:00 AM GMT | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert HST to GMT
Add 10 hours to the HST time to get GMT.
Example: 9:00 AM HST = 7:00 PM GMT.
Across midnight: 10:00 PM HST = 8:00 AM GMT (next day). The date changes, so always check the day as well as the hour.
Time difference between HST and GMT
The time difference between HST and GMT is 10 hours all year – GMT is ahead of HST.
HST and GMT during daylight saving time
- HST does not observe daylight saving time; it stays on UTC−10 all year.
- GMT does not observe daylight saving time; it stays on UTC+0 all year.
Best time for a meeting between HST and GMT
HST and GMT have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM HST, which is 5:00 PM GMT.
HST to GMT FAQ
What is the time difference between HST and GMT?
GMT is 10 hours ahead of HST all year. 9:00 AM HST = 7:00 PM GMT.
What is 9 AM HST in GMT?
9:00 AM HST is 7:00 PM GMT.
What is 12 PM (noon) HST in GMT?
12:00 PM HST is 10:00 PM GMT.
Is GMT ahead of or behind HST?
GMT is 10 hours ahead of HST, so it is later in GMT than in HST.
Does HST change for daylight saving time?
No. HST stays on the same offset all year, so conversions never shift for daylight saving time.
Does GMT change for daylight saving time?
No. GMT stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between HST and GMT?
HST and GMT have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM HST, which is 5:00 PM GMT.
Related conversions
Convert GMT to HST
Convert HST to other time zones
Convert other time zones to GMT
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.