What is BST in JST?

Japan Standard Time is 9 hours ahead

British Time is on UTC+0:00 and Japan Standard Time is on UTC+9:00 right now. The gap changes during the year — see below.

Convert a time

GMT — British Time

JST — Japan Standard Time

5:00 pm

JST, Sat

Time in London: 8:29:22 AM
Time in Tokyo: 5:29:22 PM
Difference: +9 h
Next clock change: March 28, 2027

When the difference changes

British Time and Japan Standard Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:

Now – March 28, 2027Japan Standard Time is 9 hours ahead
March 28, 2027 – October 31, 2027Japan Standard Time is 8 hours ahead
October 31, 2027 – onwardsJapan Standard Time is 9 hours ahead

Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.

Daylight saving

British Time

Sunday, March 28, 2027

Clocks go forward one hour — 1:00 am becomes 2:00 am local time, and the zone is on BST after that.

Japan Standard Time

No clock changes

Japan Standard Time stays on JST all year, so its offset from UTC never moves.

BST to JST conversion table

Every hour of Saturday, November 7, 2026, converted from British Time to Japan Standard Time. 9 of the 24 hours fall on a different calendar day in Tokyo, which is marked.

12:00 am GMT: 9:00 am JST
1:00 am GMT: 10:00 am JST
2:00 am GMT: 11:00 am JST
3:00 am GMT: 12:00 pm JST
4:00 am GMT: 1:00 pm JST
5:00 am GMT: 2:00 pm JST
6:00 am GMT: 3:00 pm JST
7:00 am GMT: 4:00 pm JST
8:00 am GMT: 5:00 pm JST
9:00 am GMT: 6:00 pm JST
10:00 am GMT: 7:00 pm JST
11:00 am GMT: 8:00 pm JST

12:00 pm GMT: 9:00 pm JST
1:00 pm GMT: 10:00 pm JST
2:00 pm GMT: 11:00 pm JST
3:00 pm GMT: 12:00 am JST+1 day
4:00 pm GMT: 1:00 am JST+1 day
5:00 pm GMT: 2:00 am JST+1 day
6:00 pm GMT: 3:00 am JST+1 day
7:00 pm GMT: 4:00 am JST+1 day
8:00 pm GMT: 5:00 am JST+1 day
9:00 pm GMT: 6:00 am JST+1 day
10:00 pm GMT: 7:00 am JST+1 day
11:00 pm GMT: 8:00 am JST+1 day

Scheduling between the two

There is no overlap between a nine-to-six working day in London and one in Tokyo — the gap is too wide. A call has to sit early or late for one side. Early morning in London is the usual compromise, since that is late afternoon or evening in Tokyo.

A note on BST: it can also mean Bangladesh Standard Time (UTC+6). This page means British Summer Time.

British Time (GMT) is used in the whole United Kingdom. In winter the UK is on GMT; from late March to late October it is on BST, an hour ahead.