GMT to JST converter
UK Time (GMT) is typically 9 hours behind Japan Standard Time (JST).
UK Time → Japan Standard Time, hour by hour below.
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UK Time (GMT) is UTC+0 and observes British Summer Time (BST, UTC+1, roughly March–October). It covers London, Manchester and Edinburgh.
Japan Standard Time (JST) is UTC+9 with no daylight saving. It covers Tokyo, Osaka and Sapporo (Seoul shares the same clock).
Japan Standard Time is typically 9 hours ahead of UK Time, though daylight saving can shift the difference by an hour at some times of year.
Time difference between UK Time and Japan Standard Time
Japan Standard Time is typically 9 hours ahead of UK Time, though daylight saving can shift the difference by an hour at some times of year. Put the other way around: japan Standard Time (JST) is typically 9 hours ahead of UK Time (GMT). The table above shows the difference hour by hour using today's actual offsets.
Best time to call Japan Standard Time from UK Time
There's no 9-to-5 overlap between UK Time and Japan Standard Time, so one side always has to flex. The practical slots: 7:00 AM in UK Time is 4:00 PM in Japan Standard Time. Daylight saving can shift these times by an hour at some points in the year.
GMT to JST, hour by hour
Today's actual offsets. Rows where both zones are inside 9am–5pm working hours are highlighted.