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BST to JST: convert British Time to Japan Standard Time

In January, JST is 9 hours ahead of BST. In July it is 8 hours ahead of. The gap moves because the two regions handle daylight saving differently.

The United Kingdom uses GMT in winter and BST (British Summer Time) in summer. BST also abbreviates Bangladesh Standard Time (UTC+6).

One instant, two local clocks

Drag one day across both zones

Shared instant12:00 UTC
Difference nowJST is 9 hours ahead
BSTBritish Time
12:00Thu, Jan 15
JSTJapan Standard Time
21:00Thu, Jan 15
Approximate daylight 09:00 to 17:00 Selected local time

Both lanes show the same instant. Local dates, daylight, and offsets come from each IANA zone on the selected date, so daylight saving changes are included.

Right now

BST: British Time

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JST: Japan Standard Time

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Local times come from your browser's IANA time zone data.

BST to JST hour by hour

Two columns because the gap changes with daylight saving: use the January column roughly November to mid-March, the July column mid-March to October. Exact switch dates vary by year.

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

Scheduling a call between BST and JST

Standard business hours (9:00 AM to 5:00 PM) do not overlap in January: daytime in British Time falls outside the working day in Japan Standard Time, so one side needs an early morning or late evening.

In July standard business hours do not overlap at all.

JST to BST (reverse)Open the full converter

More BST conversions

Offsets are computed from the IANA time zone database for January 15 and July 15 of the current year. BST here means British Time (United Kingdom); JST means Japan Standard Time (Japan).