JST to GMT converter

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

UK Time (GMT) is UTC+0 and observes British Summer Time (BST, UTC+1, roughly March–October). It covers London, Manchester and Edinburgh.

UK Time is typically 9 hours behind Japan Standard Time, though daylight saving can shift the difference by an hour at some times of year.

Best time to call UK Time from Japan Standard Time

There's no 9-to-5 overlap between Japan Standard Time and UK Time — one side always has to flex. The practical slots: 7:00 PM in Japan Standard Time is 10:00 AM in UK Time. Daylight saving can shift these times by an hour at some points in the year.