BST to JST
+8hBST
BSTSOURCEJST
JSTGreen rows indicate typical business hours (9 AM - 5 PM)
BST and JST on the World Map
The map below highlights the BST (British Summer Time) and JST (Japan Standard Time) timezone regions across the globe.
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 – 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.
Time Conversion Guide: BST to JST
BST runs on British Summer Time (BST) at UTC+01:00. JST runs on Japan Standard Time (JST) at UTC+09:00. That puts BST 8 hours ahead of JST — a difference of +8h at the current offsets.
In practice, when it is 9:00 AM in BST it is 5:00 PM in JST. Midnight in BST is 8:00 AM in JST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
BST to JST time conversion table
| BST (BST) | JST (JST) | Day |
|---|---|---|
| 12:00 AM | 8:00 AM | same day |
| 6:00 AM | 2:00 PM | same day |
| 7:00 AM | 3:00 PM | same day |
| 8:00 AM | 4:00 PM | same day |
| 9:00 AM | 5:00 PM | same day |
| 12:00 PM | 8:00 PM | same day |
| 3:00 PM | 11:00 PM | same day |
| 5:00 PM | 1:00 AM | next day |
| 6:00 PM | 2:00 AM | next day |
| 9:00 PM | 5:00 AM | next day |
Why people convert BST to JST time
- Scheduling a call from BST to JST: a 10:00 AM start in BST lands at 6:00 PM in JST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +8h gap: BST and JST 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 JST is 5:00 PM in BST.
- Booking travel or deliveries: tracking JST local time against BST keeps pickup windows and arrival estimates honest across the +8h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM BST" 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 BST takes the early slot, the next week JST does.
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.
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.
Best time to call between BST and JST
With a +8h offset there is no overlap inside a normal 9 AM – 5 PM day. JST opens at 9:00 AM JST, which is 5:00 PM in BST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
BST and JST have no shared working hours because of the +8h gap. Teams need to alternate early starts or rely on asynchronous handovers.
BST is 8 hours ahead of JST (BST UTC+01:00 → JST UTC+09:00). 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
BST
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
JST
Does not observe DST
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 BST and JST?
BST (BST, UTC+01:00) is 8 hours ahead of JST (JST, UTC+09:00). The gap is currently +8h.
How do I convert BST time to JST time?
Add +8h to BST local time. For example, 9:00 AM in BST is 5:00 PM in JST.
What time is it in JST right now?
JST uses JST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +8h offset from BST.
What is the best time to call JST from BST?
There is no shared working-hours window because of the +8h gap. The closest option is 1:00 PM in BST, which is 9:00 PM in JST.
Which is ahead, BST or JST?
BST is 8 hours ahead of JST. When it is 12:00 PM in BST it is 8:00 PM in JST.
Does daylight saving time affect the BST–JST difference?
Neither zone observes daylight saving time, so the +8h offset between BST and JST is fixed all year.
Which other cities share BST's time zone?
BST also covers London, Birmingham, Manchester, Glasgow, Edinburgh, Cardiff, Belfast, Liverpool and 2 more.
Which countries use BST, BST's zone?
BST is used in United Kingdom.
Is there a day difference between BST and JST?
Not normally. The +8h gap only pushes the date over for late-evening times.
What is the time difference between BST and JST?
JST is +8h from BST.
What timezone is BST in?
BST operates on its local timezone.
What timezone is JST in?
JST operates on its local timezone.
Which countries use BST (British Summer Time)?
BST is used in United Kingdom.
Does BST observe daylight saving time?
Yes, BST switches to BST during summer months.
What are some interesting facts about BST?
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.
Which cities are in the JST timezone?
Major cities in the JST timezone include Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka.
What is the UTC offset for JST?
Japan Standard Time (JST) is at UTC+09:00.
What should I know about the JST timezone?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
When is it midnight in BST, what time is it in JST?
When it is 12:00 AM (midnight) in BST (BST), it is +8h later in JST (JST).
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