GMT → HST Converter
London to Hawaii — extremely wide gap (10-11 hours). Military, oceanographic research, and inter-governmental coordination. Rarely requires live calls.
GMT → HST
7:40 PM
British Summer Time (GMT+1)
Thursday, June 11, 2026
UTC+1 (DST active)
8:40 AM
Hawaii-Aleutian Standard Time (HST)
Thursday, June 11, 2026
UTC-10 (DST active)
Time Zone Converter
GMT·London
7:40 PM
Thursday, June 11, 2026
HST·Honolulu
8:40 AM
Thursday, June 11, 2026
Compare Times
| GMT | HST |
|---|
Morning
| GMT | HST |
|---|---|
| 12:00 AM GMT | 2:00 PM HST |
| 1:00 AM GMT | 3:00 PM HST |
| 2:00 AM GMT | 4:00 PM HST |
| 3:00 AM GMT | 5:00 PM HST |
| 4:00 AM GMT | 6:00 PM HST |
| 5:00 AM GMT | 7:00 PM HST |
| 6:00 AM GMT | 8:00 PM HST |
| 7:00 AM GMT | 9:00 PM HST |
| 8:00 AM GMT | 10:00 PM HST |
| 9:00 AM GMT | 11:00 PM HST |
| 10:00 AM GMT | 12:00 AM HST |
| 11:00 AM GMT | 1:00 AM HST |
Afternoon
| GMT | HST |
|---|---|
| 12:00 PM GMT | 2:00 AM HST |
| 1:00 PM GMT | 3:00 AM HST |
| 2:00 PM GMT | 4:00 AM HST |
| 3:00 PM GMT | 5:00 AM HST |
| 4:00 PM GMT | 6:00 AM HST |
Evening
| GMT | HST |
|---|---|
| 5:00 PM GMT | 7:00 AM HST |
| 6:00 PM GMT | 8:00 AM HST |
| 7:00 PM GMT | 9:00 AM HST |
| 8:00 PM GMT | 10:00 AM HST |
| 9:00 PM GMT | 11:00 AM HST |
| 10:00 PM GMT | 12:00 PM HST |
| 11:00 PM GMT | 1:00 PM HST |
Frequently Asked Questions: GMT to HST
What is the time difference between UK Time and Hawaii Time?
HST is 10 hours behind GMT (standard time).
What time is midnight in GMT in HST?
Midnight (12:00 AM) in UK Time translates to 2:00 PM HST in Hawaii Time.
When do business hours overlap between GMT and HST?
Standard 9–5 business hours do not overlap between UK Time and Hawaii Time. The closest scheduling window is 19:00–20:00 GMT (09:00–10:00 HST).
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.
HST is 10 hours behind GMT (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 Honolulu from London
Planning a remote meeting or international call? The optimal business hours overlap between London and Honolulu is challenging, with few shared business hours between the two zones.
Try Meeting Planner for multi-city group scheduling →GMT
19:00–20:00
Greenwich Time
HST
09:00–10:00
Hawaii Time
Recommended time: 19:00 GMT / 09:00 HST
DST schedule for 2026
Current-year daylight saving start and end dates for the selected zones.
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.
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.
Principal Cities
GMT — Greenwich Time
- LondonUnited Kingdom
- DublinIreland
- LisbonPortugal
- CasablancaMorocco
HST — Hawaii Time
- HonoluluUnited States
- Pearl CityUnited States
- HiloUnited States
- KailuaUnited States