Time zone converter

JST to GMT

On Oct 23, 2026, UK time is 8 hours behind Japan Standard Time: 9:00 AM JST is 1:00 AM BST. The gap changes during the year because of daylight saving time; the dates are below.

Japan Standard Time
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Current time in Japan Standard Time
UK time
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Current time in UK time
Pick a date and time to convert.

GMT vs JST over the next 12 months

PeriodGMT isExample
Oct 23, 2026 to Oct 25, 20268 hours behind9:00 AM JST = 1:00 AM BST
Oct 25, 2026 to Mar 28, 20279 hours behind9:00 AM JST = 12:00 AM GMT
Mar 28, 2027 onwards8 hours behind9:00 AM JST = 1:00 AM BST

JST to GMT conversion table

Every hour of a weekday around Oct 23, 2026, in both zones.

Japan Standard TimeUK time
12:00 AM3:00 PM (previous day)
1:00 AM4:00 PM (previous day)
2:00 AM5:00 PM (previous day)
3:00 AM6:00 PM (previous day)
4:00 AM7:00 PM (previous day)
5:00 AM8:00 PM (previous day)
6:00 AM9:00 PM (previous day)
7:00 AM10:00 PM (previous day)
8:00 AM11:00 PM (previous day)
9:00 AM12:00 AM
10:00 AM1:00 AM
11:00 AM2:00 AM
12:00 PM3:00 AM
1:00 PM4:00 AM
2:00 PM5:00 AM
3:00 PM6:00 AM
4:00 PM7:00 AM
5:00 PM8:00 AM
6:00 PM9:00 AM
7:00 PM10:00 AM
8:00 PM11:00 AM
9:00 PM12:00 PM
10:00 PM1:00 PM
11:00 PM2:00 PM

Best time for a meeting

There is no 9-to-5 overlap; within an 8 AM–8 PM day the zones overlap for 3 hours on a weekday: 5:00 PM–8:00 PM JST, which is 8:00 AM–11:00 AM GMT.

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Daylight saving time

UK time (GMT/BST)

  • Oct 25, 2026: clocks go back 1 hour at 2:00 AM (UTC+1 → UTC±0)
  • Mar 28, 2027: clocks go forward 1 hour at 1:00 AM (UTC±0 → UTC+1)

Where these clocks are used

  • Japan Standard Time (JST): all of Japan. IANA zone Asia/Tokyo.
  • UK time (GMT/BST): London, Edinburgh, Dublin and Lisbon keep the same clock. IANA zone Europe/London.

Questions

What time is it in GMT when it is 9 AM JST?

On Oct 23, 2026, 9:00 AM JST is 1:00 AM BST. On other dates the answer can shift by an hour because of daylight saving time; the table of periods on this page gives each one.

How many hours behind JST is GMT?

It depends on the date. Oct 23, 2026 to Oct 25, 2026: GMT is 8 hours behind. Oct 25, 2026 to Mar 28, 2027: GMT is 9 hours behind. Mar 28, 2027 onwards: GMT is 8 hours behind.

Do JST and GMT observe daylight saving time?

Japan Standard Time stays on UTC+9 all year. UK time switches to BST (UTC+1) in summer and back to GMT (UTC±0) in winter.

What is the best time for a meeting between JST and GMT?

There is no 9-to-5 overlap; within an 8 AM–8 PM day the zones overlap for 3 hours on a weekday: 5:00 PM–8:00 PM JST, which is 8:00 AM–11:00 AM GMT.

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Related conversions

Computed from the IANA time zone database on Oct 23, 2026. Live clocks and the converter use your browser's copy of the same data.