BST to HST Converter
HST is 10 hours behind GMT. 9:00 AM GMT = 11:00 PM HST (previous day).
HST is 10 hours behind GMT at the moment. To convert BST to HST, subtract 10 hours from the BST time: 9:00 AM GMT = 11:00 PM HST (previous day).
BST (British Time) is used in United Kingdom from late March to late October. HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time).
BST here means British Summer Time, not Bangladesh Standard Time. BST (British Summer Time) is not in force right now: United Kingdom from late March to late October is currently on GMT. This page uses whichever name applies on the date you pick, so the numbers below say GMT.
BST to HST time conversion table
BST to HST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| BST | HST | Day |
|---|---|---|
| 12:00 AM GMT | 2:00 PM HST | previous day |
| 1:00 AM GMT | 3:00 PM HST | previous day |
| 2:00 AM GMT | 4:00 PM HST | previous day |
| 3:00 AM GMT | 5:00 PM HST | previous day |
| 4:00 AM GMT | 6:00 PM HST | previous day |
| 5:00 AM GMT | 7:00 PM HST | previous day |
| 6:00 AM GMT | 8:00 PM HST | previous day |
| 7:00 AM GMT | 9:00 PM HST | previous day |
| 8:00 AM GMT | 10:00 PM HST | previous day |
| 9:00 AM GMT | 11:00 PM HST | previous day |
| 10:00 AM GMT | 12:00 AM HST | night |
| 11:00 AM GMT | 1:00 AM HST | night |
| 12:00 PM GMT | 2:00 AM HST | night |
| 1:00 PM GMT | 3:00 AM HST | night |
| 2:00 PM GMT | 4:00 AM HST | night |
| 3:00 PM GMT | 5:00 AM HST | night |
| 4:00 PM GMT | 6:00 AM 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 | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert BST to HST
Subtract 10 hours from the BST time to get HST.
Example: 9:00 AM GMT = 11:00 PM HST (previous day).
Across midnight: 1:00 AM GMT = 3:00 PM HST (previous day). The date changes, so always check the day as well as the hour.
Time difference between BST and HST
The time difference between BST and HST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 1 Jan 2026 – 28 Mar 2026: HST is 10 hours behind of BST.
- 29 Mar 2026 – 24 Oct 2026: HST is 11 hours behind of BST.
- 25 Oct 2026 – 31 Dec 2026: HST is 10 hours behind of BST.
BST and HST during daylight saving time
- BST next changes on 28 Mar 2027: clocks go forward one hour at 00:59 local time, from GMT (UTC+0) to BST (UTC+1).
- HST does not observe daylight saving time; it stays on UTC−10 all year.
Best time for a meeting between BST and HST
BST and HST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM GMT, which is 9:00 PM HST.
BST to HST FAQ
What is the time difference between BST and HST?
Right now HST is 10 hours behind GMT. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM BST in HST?
9:00 AM GMT is 11:00 PM HST (previous day).
What is 12 PM (noon) BST in HST?
12:00 PM GMT is 2:00 AM HST.
Is HST ahead of or behind BST?
HST is 10 hours behind GMT, so it is earlier in HST than in BST.
Does BST change for daylight saving time?
Yes. BST next changes on 28 Mar 2027, when clocks go forward one hour from GMT to BST.
Does HST change for daylight saving time?
No. HST stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between BST and HST?
BST and HST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM GMT, which is 9:00 PM HST.
Related conversions
Convert HST to BST
Convert BST to other time zones
Convert other time zones to HST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.