No overlap — one side will join outside working hours
JST (Tokyo)
GMT (London)
00:00
16:00-1dWorking
01:00
17:00-1d
02:00
18:00-1d
03:00
19:00-1d
04:00
20:00-1d
05:00
21:00-1d
06:00
22:00-1d
07:00
23:00-1d
08:00
00:00
09:00Working
01:00off
10:00Working
02:00off
11:00Working
03:00off
12:00Working
04:00off
13:00Working
05:00off
14:00Working
06:00off
15:00Working
07:00off
16:00Working
08:00off
17:00
09:00Working
18:00
10:00Working
19:00
11:00Working
20:00
12:00Working
21:00
13:00Working
22:00
14:00Working
23:00
15:00Working
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between jst and gmt?
Japan Standard Time (jst) is UTC+9 and Greenwich Mean Time (gmt) is UTC+1. The difference between them is 8 hours.
Where is jst used?
Japan Standard Time (jst) is used in Japan and surrounding regions. The IANA timezone identifier is Asia/Tokyo.
Where is gmt used?
Greenwich Mean Time (gmt) is used in United Kingdom and surrounding regions. The IANA timezone identifier is Europe/London.
How do I convert jst to gmt?
Use the interactive converter above. Drag the time slider to any jst time and the gmt equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
JST (Tokyo) is 8 hours ahead of GMT (London). At noon in JST (Tokyo), your contact in GMT (London) sees 04:00.
JST (Tokyo) runs on Asia/Tokyo; GMT (London) runs on Europe/London. Together they are 8 hours apart.
Mutual working hours
There is no business hours overlap between JST (Tokyo) and GMT (London) during standard working hours (9:00–17:00). Meetings would require one party to work outside normal hours.
Best call times between these locations
JST (Tokyo) and GMT (London) have no shared working window. These slots minimize out-of-hours disruption for both sides.
16:00 Tokyo / 08:00 London⚡ One side off-hours
⚠️ 1h before working hours in London
17:00 Tokyo / 09:00 London⚡ One side off-hours
⚠️ 1h after working hours in Tokyo
15:00 Tokyo / 07:00 London⚡ One side off-hours
⚠️ 2h before working hours in London
Working hours defined as 09:00–17:00 local time for each location.
Public holidays for both locations
⚡ Holiday alerts for both locations, double-check schedules before confirming.
JST (Tokyo)7 holidays
Jul 20Marine Day
Aug 11Mountain Day
Sep 21Respect for the Aged Day
Sep 23Autumnal Equinox Day
Oct 12Sports Day
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
Scheduling between JST (Tokyo) and GMT (London)
JST (Tokyo) (Japan) and GMT (London) (United Kingdom) 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
⚡
A 16:00 meeting in JST (Tokyo) means 08:00 in GMT (London) (1h before working hours in London).
⚡
A 17:00 meeting in JST (Tokyo) means 09:00 in GMT (London) (1h after working hours in Tokyo).
⚡
A 15:00 meeting in JST (Tokyo) means 07:00 in GMT (London) (2h before working hours in London).
With no shared business hours, these slots distribute the scheduling burden as evenly as possible between both locations.
Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.
Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am JST (Tokyo)".
