UTC to JST

About Coordinated Universal Time

UTC never shifts. It is the reference every other zone is defined against, which is why logs, flight schedules and protocol timestamps use it. GMT is the same clock for every civil purpose, so a query for one is answered by the other.

Cities on this clock: Reykjavik, Accra, Abidjan, Dakar.

Watch out: GMT is also used loosely to mean "UK time", and those are not the same thing for seven months of the year — the United Kingdom moves to BST (UTC+1) while UTC stays put.

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

Neither Coordinated Universal Time nor Japan Standard Time moves its clock relative to the other, so japan standard time is 9 hours ahead of coordinated universal time is a rule rather than a fact about one particular year. The hour-by-hour table above holds on every date.

With both zones on their own standard time — daylight saving not in force anywhere — Japan Standard Time is 9 hours ahead of Coordinated Universal 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 UTC and Asia/Tokyo. Nothing is looked up on a server and nothing about your visit is recorded.