Tokyo runs on JST.

Tokyo, Japan uses Japan Standard Time (JST), which is UTC+9. Japan does not observe daylight saving time, so the offset stays the same throughout the year.

Why the time difference changes

The Tokyo clock stays fixed, but the United States and parts of Europe change their clocks for daylight saving time. That means the difference between Tokyo and New York, Los Angeles or London can change during the year.

For accurate comparisons, use a named IANA time zone such as Asia/Tokyo or America/New_York rather than a fixed offset.