Time Difference: Tokyo to London

Summary

See the current time in Tokyo and London side by side, with the fixed UTC offset (JST is UTC+9, London is GMT or BST), updated live every second.

How it works

1. Your browser reads the current moment from your device clock.
2. It converts that moment to Asia/Tokyo time (JST, UTC+9) using the IANA timezone database built into modern browsers.
3. The same moment is converted to Europe/London time (GMT or BST depending on the season).
4. The UTC offsets of both cities are compared to calculate the exact hour difference.
5. All three values — Tokyo time, London time, and the offset — refresh every second.
6. When London switches between GMT and BST, the displayed offset adjusts automatically from +9 to +8 hours.

Use cases

• Scheduling video calls between Tokyo and London offices.
• Checking if a colleague in London is still at their desk.
• Planning Japan-UK travel and arrival time comparisons.
• Remote teams coordinating daily standups across Japan and the UK.
• Finding overlapping business hours for Tokyo-London meetings.
• Converting a Tokyo meeting time to its London equivalent.
• Journalists in Tokyo checking broadcast times for live UK events.
• Students and teachers arranging online lessons between Japan and the UK.

Frequently Asked Questions