Japan Standard Time is UTC+09:00 year-round. Japan does not observe daylight saving time.
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JST covers the whole of Japan via Asia/Tokyo. South Korea uses the same UTC+09:00 offset (Korea Standard Time) with the identifier Asia/Seoul. Because there is no seasonal change, converting between JST and a DST zone such as US Pacific Time requires checking the other side’s season, not Japan’s.
The offset shown above is computed from Asia/Tokyo at page render time using Intl.DateTimeFormat. It can change when daylight saving starts or ends.
Japan does not observe daylight saving time. JST remains UTC+09:00 all year.
Japan Standard Time (JST) uses the IANA identifier Asia/Tokyo. Japan Standard Time is UTC+09:00 year-round. Japan does not observe daylight saving time.
Right now Japan Standard Time is UTC+09:00. The live abbreviation reported by the timezone database is GMT+9.
Japan does not observe daylight saving time. JST remains UTC+09:00 all year.
Use the converter with Asia/Tokyo as the source zone, or open the Time Zone Converter and pick a city that uses JST. Offsets update automatically when daylight saving begins or ends.