JST to UTC converter

Japan Standard Time (JST) is UTC+9 with no daylight saving. It covers Tokyo, Osaka and Sapporo (Seoul shares the same clock).

Coordinated Universal Time (UTC) is UTC+0 with no daylight saving. It covers the global reference used in aviation, computing and science.

Coordinated Universal Time is typically 9 hours behind Japan Standard Time, all year round; neither zone observes daylight saving.

Time difference between Japan Standard Time and Coordinated Universal Time

Coordinated Universal Time is typically 9 hours behind Japan Standard Time, all year round; neither zone observes daylight saving. Put the other way around: coordinated Universal Time (UTC) is typically 9 hours behind Japan Standard Time (JST). The table above shows the difference hour by hour using today's actual offsets.

Best time to call Coordinated Universal Time from Japan Standard Time

There's no 9-to-5 overlap between Japan Standard Time and Coordinated Universal Time, so one side always has to flex. The practical slots: 7:00 PM in Japan Standard Time is 10:00 AM in Coordinated Universal Time.