HubTools

GMT to JST

Convert London time (GMT) to Tokyo time (JST). DST-aware via IANA. Live, free, no signup.

Converting GMT to JST

Converting time from GMT (London, United Kingdom) to JST (Tokyo, Japan) means adjusting for the offset between the two zones — and that offset can shift by an hour twice a year because London and Tokyo may observe Daylight Saving Time on different schedules. The converter below uses the IANA time-zone database (Europe/London ↔ Asia/Tokyo), which carries the full DST history and ruleset. Type a time in either side, pick the date, and the matching local time on the other side updates with the correct offset for that exact day. Need to compare more than these two zones? Open the full Time Zone Converter to add up to 6 zones at once, or use the Unix Timestamp Converter for epoch-to-date arithmetic across zones.
Date
● Live
Zones
GMT · London
GMT+1Mon, 2026-05-11
JST · Tokyo
GMT+9Mon, 2026-05-11
24-hour overlap
Zone01234567891011121314151617181920212223
Europe/London12345678910111213141516171819202122230
Asia/Tokyo91011121314151617181920212223012345678
Each cell shows the local hour in that zone. Highlighted cells are standard 9 AM–5 PM business hours; look for columns where every row is highlighted to find shared work-hour windows.

How to use this tool

  1. 1
    Set the date
    DST rules differ between London and Tokyo; pick the date you're converting for.
  2. 2
    Type the GMT time
    Enter the time you have in GMT (or click "Set to now" for the current moment).
  3. 3
    Read the JST time
    The JST row updates instantly with the correct local time and offset tag.
  4. 4
    Find a shared work hour
    Scroll to the 24-hour overlap grid — highlighted columns are 9-to-5 in both zones.

Frequently asked questions

What is the time difference between GMT and JST?
The offset between GMT (London) and JST (Tokyo) is computed for the exact date you select using the browser's IANA time-zone database. Both zones may observe Daylight Saving Time on different schedules, so the gap can shift by an hour twice a year. The converter handles this automatically — type a time in either field and the other side updates with the correct offset for that date.

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