HST → GMT Converter
Hawaii to London — same wide gap. Async collaboration is the norm.
HST → GMT
8:40 AM
Hawaii-Aleutian Standard Time (HST)
Thursday, June 11, 2026
UTC-10 (DST active)
7:40 PM
British Summer Time (GMT+1)
Thursday, June 11, 2026
UTC+1 (DST active)
Time Zone Converter
HST·Honolulu
8:40 AM
Thursday, June 11, 2026
GMT·London
7:40 PM
Thursday, June 11, 2026
Compare Times
| HST | GMT |
|---|
Morning
| HST | GMT |
|---|---|
| 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 |
Afternoon
| HST | GMT |
|---|---|
| 12:00 PM HST | 10:00 PM GMT |
| 1:00 PM HST | 11:00 PM GMT |
| 2:00 PM HST | 12:00 AM GMT |
| 3:00 PM HST | 1:00 AM GMT |
| 4:00 PM HST | 2:00 AM GMT |
Evening
| HST | GMT |
|---|---|
| 5:00 PM HST | 3:00 AM GMT |
| 6:00 PM HST | 4:00 AM GMT |
| 7:00 PM HST | 5:00 AM GMT |
| 8:00 PM HST | 6:00 AM GMT |
| 9:00 PM HST | 7:00 AM GMT |
| 10:00 PM HST | 8:00 AM GMT |
| 11:00 PM HST | 9:00 AM GMT |
Frequently Asked Questions: HST to GMT
What is the time difference between Hawaii Time and UK Time?
GMT is 10 hours ahead of HST (standard time).
What time is midnight in HST in GMT?
Midnight (12:00 AM) in Hawaii Time translates to 10:00 AM GMT in UK Time.
When do business hours overlap between HST and GMT?
Standard 9–5 business hours do not overlap between Hawaii Time and UK Time. The closest scheduling window is 07:00–08:00 HST (17:00–18:00 GMT).
Common Time Conversions
EST · New York →
CST · Chicago →
MST · Denver →
PST · Los Angeles →
AKST · Anchorage →
HST · Honolulu →
UTC · Universal →
GMT · London →
IST · New Delhi →
CET · Paris →
How Time Zone Conversion Works
Time zone conversion works by comparing the UTC offset of one location to another. Every city or region is measured relative to Coordinated Universal Time (UTC), which acts as the global reference point for civil time.
GMT is 10 hours ahead of HST (standard time).
Daylight Saving Time: GMT observes DST; HST does not. The offset between them shifts by 1 hour twice a year — in spring and autumn — when GMT changes its clocks.
Best time to call London from Honolulu
Planning a remote meeting or international call? The optimal business hours overlap between Honolulu and London is challenging, with few shared business hours between the two zones.
Try Meeting Planner for multi-city group scheduling →HST
07:00–08:00
Hawaii Time
GMT
17:00–18:00
Greenwich Time
Recommended time: 07:00 HST / 17:00 GMT
DST schedule for 2026
Current-year daylight saving start and end dates for the selected zones.
HST · Hawaii Time
Standard offset −10:00
Hawaii Time remains on a constant standard offset for the year.
Hawaii does not observe DST. The Aleutian Islands portion of HAST does observe DST (becoming HADT, UTC−9), but population there is negligible. For practical purposes HST is a fixed-offset zone.
GMT · Greenwich Time
Standard offset +00:00
- Starts
- Mar 29, 2026 · 01:00 → 02:00
- last_sunday_of_march
- Ends
- Oct 25, 2026 · 02:00 → 01:00
- last_sunday_of_october
- Daylight time
- BST · +01:00
GMT countries vary. The UK, Ireland, and Portugal observe summer time; Iceland and most of West Africa remain on GMT year-round.
Principal Cities
HST — Hawaii Time
- HonoluluUnited States
- Pearl CityUnited States
- HiloUnited States
- KailuaUnited States
GMT — Greenwich Time
- LondonUnited Kingdom
- DublinIreland
- LisbonPortugal
- CasablancaMorocco