GMT to JST
On Oct 23, 2026, Japan Standard Time is 8 hours ahead of UK time: 9:00 AM BST is 5:00 PM JST. The gap changes during the year because of daylight saving time; the dates are below.
JST vs GMT over the next 12 months
| Period | JST is | Example |
|---|---|---|
| Oct 23, 2026 to Oct 25, 2026 | 8 hours ahead | 9:00 AM BST = 5:00 PM JST |
| Oct 25, 2026 to Mar 28, 2027 | 9 hours ahead | 9:00 AM GMT = 6:00 PM JST |
| Mar 28, 2027 onwards | 8 hours ahead | 9:00 AM BST = 5:00 PM JST |
GMT to JST conversion table
Every hour of a weekday around Oct 23, 2026, in both zones.
| UK time | Japan Standard Time |
|---|---|
| 12:00 AM | 9:00 AM |
| 1:00 AM | 10:00 AM |
| 2:00 AM | 11:00 AM |
| 3:00 AM | 12:00 PM |
| 4:00 AM | 1:00 PM |
| 5:00 AM | 2:00 PM |
| 6:00 AM | 3:00 PM |
| 7:00 AM | 4:00 PM |
| 8:00 AM | 5:00 PM |
| 9:00 AM | 6:00 PM |
| 10:00 AM | 7:00 PM |
| 11:00 AM | 8:00 PM |
| 12:00 PM | 9:00 PM |
| 1:00 PM | 10:00 PM |
| 2:00 PM | 11:00 PM |
| 3:00 PM | 12:00 AM (next day) |
| 4:00 PM | 1:00 AM (next day) |
| 5:00 PM | 2:00 AM (next day) |
| 6:00 PM | 3:00 AM (next day) |
| 7:00 PM | 4:00 AM (next day) |
| 8:00 PM | 5:00 AM (next day) |
| 9:00 PM | 6:00 AM (next day) |
| 10:00 PM | 7:00 AM (next day) |
| 11:00 PM | 8:00 AM (next day) |
Best time for a meeting
There is no 9-to-5 overlap; within an 8 AM–8 PM day the zones overlap for 3 hours on a weekday: 8:00 AM–11:00 AM GMT, which is 5:00 PM–8:00 PM JST.
Comparing more than two places? The meeting planner lines up working hours for up to six cities.
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. - Japan Standard Time (JST): all of Japan. IANA zone
Asia/Tokyo.
Questions
What time is it in JST when it is 9 AM GMT?
On Oct 23, 2026, 9:00 AM BST is 5:00 PM JST. 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 ahead of GMT is JST?
It depends on the date. Oct 23, 2026 to Oct 25, 2026: JST is 8 hours ahead. Oct 25, 2026 to Mar 28, 2027: JST is 9 hours ahead. Mar 28, 2027 onwards: JST is 8 hours ahead.
Do GMT and JST observe daylight saving time?
UK time switches to BST (UTC+1) in summer and back to GMT (UTC±0) in winter. Japan Standard Time stays on UTC+9 all year.
What is the best time for a meeting between GMT and JST?
There is no 9-to-5 overlap; within an 8 AM–8 PM day the zones overlap for 3 hours on a weekday: 8:00 AM–11:00 AM GMT, which is 5:00 PM–8:00 PM JST.
Scheduling across time zones? Share one Caly booking link and every guest sees your free times in their own zone. Try Caly free
Related conversions
- JST to GMT (reverse)
- EST to JST
- CST to JST
- MST to JST
- PST to JST
- UTC to JST
- GMT to EST
- GMT to CST
- GMT to MST
- GMT to PST
- GMT to UTC
- GMT to CET
- 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.