BST to JST Time Converter
JST is 8 hours ahead of BST. BST is UTC+1:00, and JST is UTC+9:00.
Best Time to Call Between BST and JST
Standard 9-to-5 hours in these two zones never overlap, so someone has to take the call outside their working day. The most workable window is 7:00 AM to 2:00 PM BST, which is 3:00 PM to 10:00 PM JST.
both at work BST only JST only neither — hours along the strip are BST.
Common Times Converted
BST on the left, JST on the right.
BST to JST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| BST | JST | Working hours |
|---|---|---|
| 12:00 AM | 8:00 AM | — |
| 1:00 AM | 9:00 AM | JST only |
| 2:00 AM | 10:00 AM | JST only |
| 3:00 AM | 11:00 AM | JST only |
| 4:00 AM | 12:00 PM | JST only |
| 5:00 AM | 1:00 PM | JST only |
| 6:00 AM | 2:00 PM | JST only |
| 7:00 AM | 3:00 PM | JST only |
| 8:00 AM | 4:00 PM | JST only |
| 9:00 AM | 5:00 PM | BST only |
| 10:00 AM | 6:00 PM | BST only |
| 11:00 AM | 7:00 PM | BST only |
| 12:00 PM | 8:00 PM | BST only |
| 1:00 PM | 9:00 PM | BST only |
| 2:00 PM | 10:00 PM | BST only |
| 3:00 PM | 11:00 PM | BST only |
| 4:00 PM | 12:00 AM next day | BST only |
| 5:00 PM | 1:00 AM next day | — |
| 6:00 PM | 2:00 AM next day | — |
| 7:00 PM | 3:00 AM next day | — |
| 8:00 PM | 4:00 AM next day | — |
| 9:00 PM | 5:00 AM next day | — |
| 10:00 PM | 6:00 AM next day | — |
| 11:00 PM | 7:00 AM next day | — |
What BST and JST Actually Are
BST — British Summer Time
London, Manchester, Birmingham, Glasgow, and the rest of the UK from late March to late October. Standing at UTC+1:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, October 25, 2026, to GMT. BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.
British Summer Time began in 1916 as a wartime fuel-saving measure and has run every year since, making it one of the oldest continuous daylight saving schemes in the world.
JST — Japan Standard Time
Tokyo, Osaka, Yokohama, Nagoya, Sapporo. Standing at UTC+9:00 as written, and the region does not change its clocks, so that offset holds all year. Japan does not observe daylight saving, so this offset is fixed year-round.
Japan abolished daylight saving in 1952 and has resisted every attempt to reintroduce it, including a proposal around the 2020 Olympics.
What This Means in Practice
The date changes mid-working-day
For 1 of the eight hours in a normal BST working day, the equivalent JST time falls on a different calendar date. Anything scheduled in that stretch needs the date checked as well as the time, or a Tuesday call quietly becomes a Wednesday one at the other end.
This gap is not fixed
BST changes its clocks and JST does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, October 25, 2026 unless someone resets it.
Major Cities in Each Zone
Cities on BST
Cities on JST
Frequently Asked Questions
What is the time difference between BST and JST?
JST is 8 hours ahead of BST.
What is 9:00 AM BST in JST?
9:00 AM BST is 5:00 PM JST.
What are the best hours to schedule a call between BST and JST?
Standard business hours in these two zones do not overlap at all, so one side has to work outside the 9-to-5. The most workable window is 7:00 AM to 2:00 PM BST, which is 3:00 PM to 10:00 PM JST.
Does the difference between BST and JST change during the year?
Yes. BST observes daylight saving and JST does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, October 25, 2026.
Does BST always mean British Summer Time?
BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.
Does JST always mean Japan Standard Time?
Japan does not observe daylight saving, so this offset is fixed year-round.