London to JST

About United Kingdom Time

The United Kingdom is on GMT (UTC+0) for about five months and BST (UTC+1) for the rest, changing on the last Sunday in March and the last Sunday in October. Ireland keeps exactly the same clock, so every figure here applies to Dublin as well as London.

Cities on this clock: London, Lisbon, Dublin, Edinburgh, Manchester.

About Japan Standard Time

Japan is a fixed UTC+9 and has had no daylight saving since 1951. It shares its clock with Korea exactly, so a schedule that works for Tokyo works unchanged for Seoul.

Cities on this clock: Tokyo, Osaka, Seoul.

How the difference is worked out

The gap between United Kingdom Time and Japan Standard Time is not one number. The two zones change their clocks on different dates, so for part of the year the difference is 8 hours and for the rest it is something else — the table above lists each stretch of 2026 with the date it starts and which country's clocks moved.

With both zones on their own standard time — daylight saving not in force anywhere — Japan Standard Time is 9 hours ahead of United Kingdom Time. That figure never changes; everything else on this page follows from it plus whichever clocks have moved.

Every figure here comes from the IANA time zone database via your browser's own Intl engine, using the zone ids Europe/London and Asia/Tokyo. Nothing is looked up on a server and nothing about your visit is recorded.