UTC to JST Time Converter
Coordinated Universal Time → Japan Standard Time
UTC (London) ↔ JST (Tokyo)
No overlap — one side will join outside working hours
Working hours: 09:00–17:00 local. Green = both working. Purple = one side only.
Coordinated Universal Time → Japan Standard Time
No overlap — one side will join outside working hours
Working hours: 09:00–17:00 local. Green = both working. Purple = one side only.
UTC (London) is 9 hours behind JST (Tokyo). When it's noon in UTC (London), it's 21:00 in JST (Tokyo).
UTC (London) is in the Europe/London timezone. JST (Tokyo) is in Asia/Tokyo. The difference is 9 hours.
UTC (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.
Since UTC (London) and JST (Tokyo) don't share working hours, these are the most practical options available.
⚠️ 2h before working hours in London
⚠️ 2h after working hours in Tokyo
⚠️ 3h before working hours in London
Based on standard 09:00–17:00 working hours in each location's local time.
A 9-hour difference separates UTC (London) (United Kingdom) and JST (Tokyo) (Japan) — wide enough that standard business hours don't align at all. Scheduling requires deliberate compromise from both sides.
💡 Practical scheduling guidelines
When UTC (London) is at 07:00, JST (Tokyo) reads 16:00 — 2h before working hours in London.
When UTC (London) is at 09:00, JST (Tokyo) reads 18:00 — 2h after working hours in Tokyo.
When UTC (London) is at 06:00, JST (Tokyo) reads 15:00 — 3h 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.
Get the Extension — Free →Use the time slider above to find the exact equivalent time for any moment in UTC (London). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.