No overlap — one side will join outside working hours
GMT (London)
JST (Tokyo)
00:00
08:00
01:00
09:00Working
02:00
10:00Working
03:00
11:00Working
04:00
12:00Working
05:00
13:00Working
06:00
14:00Working
07:00
15:00Working
08:00
16:00Working
09:00Working
17:00off
10:00Working
18:00off
11:00Working
19:00off
12:00Working
20:00off
13:00Working
21:00off
14:00Working
22:00off
15:00Working
23:00off
16:00Working
00:00+1doff
17:00
01:00+1d
18:00
02:00+1d
19:00
03:00+1d
20:00
04:00+1d
21:00
05:00+1d
22:00
06:00+1d
23:00
07:00+1d
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between gmt and jst?
Greenwich Mean Time (gmt) is UTC+1 and Japan Standard Time (jst) is UTC+9. The difference between them is 8 hours.
Where is gmt used?
Greenwich Mean Time (gmt) is used in United Kingdom and surrounding regions. The IANA timezone identifier is Europe/London.
Where is jst used?
Japan Standard Time (jst) is used in Japan and surrounding regions. The IANA timezone identifier is Asia/Tokyo.
How do I convert gmt to jst?
Use the interactive converter above. Drag the time slider to any gmt time and the jst equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
GMT (London) is 8 hours behind JST (Tokyo). At noon in GMT (London), your contact in JST (Tokyo) sees 20:00.
GMT (London) is in the Europe/London timezone. JST (Tokyo) is in Asia/Tokyo. The difference is 8 hours.
Mutual working hours
GMT (London) and JST (Tokyo) have no shared working hours under a standard 9:00–17:00 schedule. One side will always need to join at an off-hour.
Recommended meeting windows
Since GMT (London) and JST (Tokyo) don't share working hours, these are the most practical options available.
08:00 London / 16:00 Tokyo⚡ One side off-hours
⚠️ 1h before working hours in London
09:00 London / 17:00 Tokyo⚡ One side off-hours
⚠️ 1h after working hours in Tokyo
07:00 London / 15:00 Tokyo⚡ One side off-hours
⚠️ 2h before working hours in London
Based on standard 09:00–17:00 working hours in each location's local time.
Public holidays for both locations
⚡ Holiday alerts for both locations, double-check schedules before confirming.
GMT (London)6 holidays
Jul 13Battle of the Boyne
Aug 3Summer Bank Holiday
Aug 31Summer Bank Holiday
Nov 30Saint Andrew's Day
Dec 25Christmas Day
JST (Tokyo)7 holidays
Jul 20Marine Day
Aug 11Mountain Day
Sep 21Respect for the Aged Day
Sep 23Autumnal Equinox Day
Oct 12Sports Day
Scheduling between GMT (London) and JST (Tokyo)
GMT (London) (United Kingdom) and JST (Tokyo) (Japan) are 8 hours apart — far enough that standard 9–5 schedules do not overlap. Any real-time meeting means someone is joining outside their normal hours.
💡 Scheduling tips for these locations
⚡
When GMT (London) is at 08:00, JST (Tokyo) reads 16:00 — 1h before working hours in London.
⚡
When GMT (London) is at 09:00, JST (Tokyo) reads 17:00 — 1h after working hours in Tokyo.
⚡
When GMT (London) is at 07:00, JST (Tokyo) reads 15:00 — 2h before working hours in London.
With no shared business hours, these slots distribute the scheduling burden as evenly as possible between both locations.
DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.
Use the time slider above to find the exact equivalent time for any moment in GMT (London). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.
