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Time zonesLive · DST-aware

BST to JST Converter

See the current time in BST (London) and JST (Tokyo) side by side, the exact time difference right now, and convert any time between the two zones.

Quick presets

BST to JST Converter

BST
London
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JST
Tokyo
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Uses your browser's built-in, DST-aware time-zone data.

ToolFeather · Intl API

About converting BST to JST

British Time (London) (London) and Japan Standard Time (Tokyo) are in different time zones, so a meeting, call or stream that's convenient in one may be early or late in the other. The clocks above update live and account for daylight saving automatically, so the time difference you see is the real one for today — not a fixed number that goes stale twice a year.

To plan across the two, type a time into the BST box (or tap a quick preset) and read the JST equivalent, including a "next day" or "previous day" note when the conversion crosses midnight. For any other pair of zones or cities, use the full timezone converter.

BST vs JST: the time difference through the year

The gap between BST and JST changes during the year because only one of them uses daylight saving.

PeriodDifference
Oct 23, 2026 – Oct 24, 2026JST 8 h ahead of BST
Oct 25, 2026 – Mar 27, 2027JST 9 h ahead of BST
Mar 28, 2027 – Oct 23, 2027JST 8 h ahead of BST

Daylight-saving changes in the next year

ZoneDateOffsetChange
BSTOct 25, 2026UTC+1 → UTC+0Clocks go back 1 hour
BSTMar 28, 2027UTC+0 → UTC+1Clocks go forward 1 hour
BSTOct 31, 2027UTC+1 → UTC+0Clocks go back 1 hour

BST to JST conversion table

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

Best time to meet

The two zones

BST · British Time (London)

UK time is GMT (UTC+0) in winter and British Summer Time (BST, UTC+1) from the last Sunday in March to the last Sunday in October. Ireland and Portugal follow the same switch dates.

JST · Japan Standard Time

Japan Standard Time is UTC+9 all year. Japan has not used daylight saving since 1951.

Frequently asked questions

6 answers
What is the time difference between BST and JST?
It's shown live at the top of this page (and it can change with daylight saving). The converter uses the current, DST-aware difference between British Time (London) and Japan Standard Time, so the time you see is always right for right now.
How do I convert BST to JST?
Enter a time in the BST box and the equivalent JST time appears instantly, adjusted for the current offset between the two zones — including a note if it lands on the previous or next day.
Is this BST to JST converter accurate with daylight saving?
Yes. It uses your browser's built-in time-zone database (the IANA zones behind London and Tokyo), which tracks daylight-saving changes automatically, so the current times and difference are correct.
What time is it in Tokyo right now?
The live clock above shows the current time in Tokyo (JST), updating every second, alongside BST.
Does the BST to JST time difference change?
Yes. Over the next 12 months it is 8 h ahead or 9 h ahead, depending on the date — see the table of periods on this page.
What is a good meeting time for BST and JST?
Standard 9-to-5 office hours don't overlap; early morning in one zone and evening in the other is the usual compromise — see the table on this page.