What is JST in BST?
British Time is 8 hours behind
Japan Standard Time is on UTC+9:00 and British Time is on UTC+1:00 right now. British Time is on daylight saving, so its clocks read BST. The gap changes during the year — see below.
- Time in Tokyo
- 11:14 am
- Time in London
- 3:14 am
- Difference
- −8 h
- Next clock change
- October 25, 2026
Convert a time
BST — British Time
3:00 am
Wed
When the difference changes
Japan Standard Time and British 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 – October 25, 2026British Time is 8 hours behind
- October 25, 2026 – March 28, 2027British Time is 9 hours behind
- March 28, 2027 – onwardsBritish Time is 8 hours behind
Periods shorter than a day are not listed: both zones change at 2am in their own local time, so there are a few hours on each transition date when the gap is briefly something else.
Daylight saving
Japan Standard Time
Japan Standard Time stays on JST all year, so its offset from UTC never moves.
British Time
Clocks go back one hour at 2am local time, becoming GMT.
JST to BST conversion table
Every hour of Wednesday, September 23, 2026, converted from Japan Standard Time to British Time. 8 of the 24 hours fall on a different calendar day in London, which is marked.
- 12:00 am JST
- 4:00 pm BST−1 day
- 1:00 am JST
- 5:00 pm BST−1 day
- 2:00 am JST
- 6:00 pm BST−1 day
- 3:00 am JST
- 7:00 pm BST−1 day
- 4:00 am JST
- 8:00 pm BST−1 day
- 5:00 am JST
- 9:00 pm BST−1 day
- 6:00 am JST
- 10:00 pm BST−1 day
- 7:00 am JST
- 11:00 pm BST−1 day
- 8:00 am JST
- 12:00 am BST
- 9:00 am JST
- 1:00 am BST
- 10:00 am JST
- 2:00 am BST
- 11:00 am JST
- 3:00 am BST
- 12:00 pm JST
- 4:00 am BST
- 1:00 pm JST
- 5:00 am BST
- 2:00 pm JST
- 6:00 am BST
- 3:00 pm JST
- 7:00 am BST
- 4:00 pm JST
- 8:00 am BST
- 5:00 pm JST
- 9:00 am BST
- 6:00 pm JST
- 10:00 am BST
- 7:00 pm JST
- 11:00 am BST
- 8:00 pm JST
- 12:00 pm BST
- 9:00 pm JST
- 1:00 pm BST
- 10:00 pm JST
- 2:00 pm BST
- 11:00 pm JST
- 3:00 pm BST
Scheduling between the two
Working hours overlap from 5:00 pm to 6:00 pm JST, which is 9:00 am to 10:00 am BST. Anything inside that window falls in the normal working day at both ends.
A note on BST: it can also mean Bangladesh Standard Time (UTC+6). This page means British Summer Time.
British Time (BST) 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.