GMT to HST
On Oct 23, 2026, Hawaii Time is 11 hours behind UK time: 9:00 AM BST is 10:00 PM HST the previous day. The gap changes during the year because of daylight saving time; the dates are below.
HST vs GMT over the next 12 months
| Period | HST is | Example |
|---|---|---|
| Oct 23, 2026 to Oct 25, 2026 | 11 hours behind | 9:00 AM BST = 10:00 PM HST (previous day) |
| Oct 25, 2026 to Mar 28, 2027 | 10 hours behind | 9:00 AM GMT = 11:00 PM HST (previous day) |
| Mar 28, 2027 onwards | 11 hours behind | 9:00 AM BST = 10:00 PM HST (previous day) |
GMT to HST conversion table
Every hour of a weekday around Oct 23, 2026, in both zones.
| UK time | Hawaii Time |
|---|---|
| 12:00 AM | 2:00 PM (previous day) |
| 1:00 AM | 3:00 PM (previous day) |
| 2:00 AM | 4:00 PM (previous day) |
| 3:00 AM | 5:00 PM (previous day) |
| 4:00 AM | 6:00 PM (previous day) |
| 5:00 AM | 7:00 PM (previous day) |
| 6:00 AM | 8:00 PM (previous day) |
| 7:00 AM | 9:00 PM (previous day) |
| 8:00 AM | 10:00 PM (previous day) |
| 9:00 AM | 11:00 PM (previous day) |
| 10:00 AM | 12:00 AM |
| 11:00 AM | 1:00 AM |
| 12:00 PM | 2:00 AM |
| 1:00 PM | 3:00 AM |
| 2:00 PM | 4:00 AM |
| 3:00 PM | 5:00 AM |
| 4:00 PM | 6:00 AM |
| 5:00 PM | 7:00 AM |
| 6:00 PM | 8:00 AM |
| 7:00 PM | 9:00 AM |
| 8:00 PM | 10:00 AM |
| 9:00 PM | 11:00 AM |
| 10:00 PM | 12:00 PM |
| 11:00 PM | 1:00 PM |
Best time for a meeting
There is no 9-to-5 overlap; within an 8 AM–8 PM day the zones overlap for 2 hours on a weekday: 6:00 PM–8:00 PM GMT, which is 8:00 AM–10:00 AM HST.
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Daylight saving time
UK time (GMT/BST)
- Oct 25, 2026: clocks go back 1 hour at 2:00 AM (UTC+1 → UTC±0)
- Mar 28, 2027: clocks go forward 1 hour at 1:00 AM (UTC±0 → UTC+1)
Where these clocks are used
- UK time (GMT/BST): London, Edinburgh, Dublin and Lisbon keep the same clock. IANA zone
Europe/London. - Hawaii Time (HST): Hawaii, which does not observe daylight saving time. IANA zone
Pacific/Honolulu.
Questions
What time is it in HST when it is 9 AM GMT?
On Oct 23, 2026, 9:00 AM BST is 10:00 PM HST the previous day. On other dates the answer can shift by an hour because of daylight saving time; the table of periods on this page gives each one.
How many hours behind GMT is HST?
It depends on the date. Oct 23, 2026 to Oct 25, 2026: HST is 11 hours behind. Oct 25, 2026 to Mar 28, 2027: HST is 10 hours behind. Mar 28, 2027 onwards: HST is 11 hours behind.
Do GMT and HST observe daylight saving time?
UK time switches to BST (UTC+1) in summer and back to GMT (UTC±0) in winter. Hawaii Time stays on UTC−10 all year.
What is the best time for a meeting between GMT and HST?
There is no 9-to-5 overlap; within an 8 AM–8 PM day the zones overlap for 2 hours on a weekday: 6:00 PM–8:00 PM GMT, which is 8:00 AM–10:00 AM HST.
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Related conversions
- HST to GMT (reverse)
- GMT to EST
- GMT to CST
- GMT to MST
- GMT to PST
- GMT to UTC
- GMT to CET
- GMT to IST
- GMT to SGT
- GMT to JST
- GMT to AEST
- GMT to AKST
- All time zones
Computed from the IANA time zone database on Oct 23, 2026. Live clocks and the converter use your browser's copy of the same data.