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.

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 — one side always has to flex. The practical slots: 7:00 PM in Japan Standard Time is 10:00 AM in Coordinated Universal Time.