JST to BST Time Converter
BST is 8 hours behind JST. JST is UTC+9:00, and BST is UTC+1:00.
Best Time to Call Between JST and BST
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 3:00 PM to 10:00 PM JST, which is 7:00 AM to 2:00 PM BST.
both at work JST only BST only neither — hours along the strip are JST.
Common Times Converted
JST on the left, BST on the right.
JST to BST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| JST | BST | Working hours |
|---|---|---|
| 12:00 AM | 4:00 PM prev day | BST only |
| 1:00 AM | 5:00 PM prev day | — |
| 2:00 AM | 6:00 PM prev day | — |
| 3:00 AM | 7:00 PM prev day | — |
| 4:00 AM | 8:00 PM prev day | — |
| 5:00 AM | 9:00 PM prev day | — |
| 6:00 AM | 10:00 PM prev day | — |
| 7:00 AM | 11:00 PM prev day | — |
| 8:00 AM | 12:00 AM | — |
| 9:00 AM | 1:00 AM | JST only |
| 10:00 AM | 2:00 AM | JST only |
| 11:00 AM | 3:00 AM | JST only |
| 12:00 PM | 4:00 AM | JST only |
| 1:00 PM | 5:00 AM | JST only |
| 2:00 PM | 6:00 AM | JST only |
| 3:00 PM | 7:00 AM | JST only |
| 4:00 PM | 8:00 AM | JST only |
| 5:00 PM | 9:00 AM | BST only |
| 6:00 PM | 10:00 AM | BST only |
| 7:00 PM | 11:00 AM | BST only |
| 8:00 PM | 12:00 PM | BST only |
| 9:00 PM | 1:00 PM | BST only |
| 10:00 PM | 2:00 PM | BST only |
| 11:00 PM | 3:00 PM | BST only |
What JST and BST Actually Are
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.
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.
What This Means in Practice
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 JST
Cities on BST
Frequently Asked Questions
What is the time difference between JST and BST?
BST is 8 hours behind JST.
What is 9:00 AM JST in BST?
9:00 AM JST is 1:00 AM BST.
What are the best hours to schedule a call between JST and BST?
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 3:00 PM to 10:00 PM JST, which is 7:00 AM to 2:00 PM BST.
Does the difference between JST and BST 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 JST always mean Japan Standard Time?
Japan does not observe daylight saving, so this offset is fixed year-round.
Does BST always mean British Summer Time?
BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.