JST to BST
-8hJST
JSTSOURCEBST
BSTGreen rows indicate typical business hours (9 AM - 5 PM)
JST and BST on the World Map
The map below highlights the JST (Japan Standard Time) and BST (British Summer Time) timezone regions across the globe.
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
BST – British Summer Time
UTC+01:00British Summer Time (BST, UTC+01:00) is the daylight saving period in the United Kingdom, running from late March to late October.
- •BST runs from the last Sunday in March to the last Sunday in October.
- •BST is exactly one hour ahead of GMT, the UK's standard time.
- •During BST, London is 4 hours ahead of New York while the US is on Eastern Daylight Time.
- •The Isle of Man and the Channel Islands also observe BST.
JST vs BST: Offsets, DST and Best Call Times
JST runs on Japan Standard Time (JST) at UTC+09:00. BST runs on British Summer Time (BST) at UTC+01:00. That puts JST 8 hours behind BST — a difference of -8h at the current offsets.
In practice, when it is 9:00 AM in JST it is 1:00 AM in BST. Midnight in JST is 4:00 PM in BST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
JST to BST time conversion table
| JST (JST) | BST (BST) | Day |
|---|---|---|
| 12:00 AM | 4:00 PM | previous day |
| 6:00 AM | 10:00 PM | previous day |
| 7:00 AM | 11:00 PM | previous day |
| 8:00 AM | 12:00 AM | same day |
| 9:00 AM | 1:00 AM | same day |
| 12:00 PM | 4:00 AM | same day |
| 3:00 PM | 7:00 AM | same day |
| 5:00 PM | 9:00 AM | same day |
| 6:00 PM | 10:00 AM | same day |
| 9:00 PM | 1:00 PM | same day |
Why people convert JST to BST time
- Scheduling a call from JST to BST: a 10:00 AM start in JST lands at 2:00 AM in BST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -8h gap: JST and BST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in BST is 1:00 AM in JST.
- Watching a live event or market open: JST viewers need 1:00 AM in BST to catch a 9:00 AM start there, and 8:00 AM if the event is anchored to JST.
- Always state the zone abbreviation, not just the hour. "3:00 PM JST" is unambiguous; "3 PM" across a -8h gap is not.
- With a -8h gap there is no shared 9-to-5 window, so alternate the early start: one week JST takes the early slot, the next week BST does.
About JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
About BST (British Summer Time)
British Summer Time (BST) is the daylight saving period in the United Kingdom, when clocks move one hour forward from Greenwich Mean Time (GMT, UTC+00:00) to UTC+01:00. It runs from the last Sunday in March to the last Sunday in October. England, Scotland, Wales and Northern Ireland all follow it, along with the Isle of Man and the Channel Islands of Jersey and Guernsey. During BST, London is one hour ahead of UTC, four hours ahead of New York on Eastern Daylight Time, and five hours ahead of New York once the United States returns to Eastern Standard Time in November. BST is also used to abbreviate Bangladesh Standard Time (UTC+06:00), which is listed separately on this site.
Best time to call between JST and BST
With a -8h offset there is no overlap inside a normal 9 AM – 5 PM day. BST opens at 9:00 AM BST, which is 1:00 AM in JST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
JST and BST have no shared working hours because of the -8h gap. Teams need to alternate early starts or rely on asynchronous handovers.
JST is 8 hours behind BST (JST UTC+09:00 → BST UTC+01:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
JST
Does not observe DST
BST
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between JST and BST?
JST (JST, UTC+09:00) is 8 hours behind BST (BST, UTC+01:00). The gap is currently -8h.
How do I convert JST time to BST time?
Add -8h to JST local time. For example, 9:00 AM in JST is 1:00 AM in BST.
What time is it in BST right now?
BST uses BST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -8h offset from JST.
What is the best time to call BST from JST?
There is no shared working-hours window because of the -8h gap. The closest option is 1:00 PM in JST, which is 5:00 AM in BST.
Which is behind, JST or BST?
JST is 8 hours behind BST. When it is 12:00 PM in JST it is 4:00 AM in BST.
Does daylight saving time affect the JST–BST difference?
Neither zone observes daylight saving time, so the -8h offset between JST and BST is fixed all year.
Which other cities share JST's time zone?
JST also covers Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka and 1 more.
Which countries use JST, JST's zone?
JST is used in Japan.
Is there a day difference between JST and BST?
Not normally. The -8h gap only pushes the date over the previous day.
What is the time difference between JST and BST?
BST is -8h from JST.
What timezone is JST in?
JST operates on its local timezone.
What timezone is BST in?
BST operates on its local timezone.
Which countries use JST (Japan Standard Time)?
JST is used in Japan.
Does JST observe daylight saving time?
No, JST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about JST?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
Which cities are in the BST timezone?
Major cities in the BST timezone include London, Birmingham, Manchester, Glasgow, Edinburgh, Cardiff, Belfast, Liverpool.
What is the UTC offset for BST?
British Summer Time (BST) is at UTC+01:00. During daylight saving time, it shifts to BST.
What should I know about the BST timezone?
BST runs from the last Sunday in March to the last Sunday in October. BST is exactly one hour ahead of GMT, the UK's standard time.
When is it midnight in JST, what time is it in BST?
When it is 12:00 AM (midnight) in JST (JST), it is -8h later in BST (BST).
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