Convert JST to BST
See the current 8-hour time difference, compare hours side by side, and schedule meetings from Japan Standard Time to British Summer Time.
How to Convert JST to BST
Open the JST to BST converter: Go to https://www.xconvert.com/time-converter/jst-to-bst-converter. The page loads with Japan Standard Time and British Summer Time already set up in the comparison grid, which is useful if you are scheduling a call between Tokyo and London, coordinating a game launch across Japan and the UK, or checking support coverage for finance, SaaS, or media teams.
Add relevant comparison cities: Click “+ Add City” and add cities such as Tokyo, London, and optionally Singapore or New York if your project also touches APAC trading desks or US stakeholders. This is especially practical for companies working across Japanese manufacturing, UK financial services, and global remote engineering teams that need to see whether one meeting can cover multiple regions.
Drag to select the meeting window: Use the “Select” button if needed, then drag across the colored timeline on the JST row to highlight a time range in purple; you can resize it with the left and right handles or move it by dragging the center. For example, if you drag 4 PM to 6 PM JST, the BST row will show 8 AM to 10 AM BST during the British Summer Time season, which is a realistic overlap for a Tokyo afternoon check-in with a London morning team.
Export and share the result: Once a range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is useful when you want to send a confirmed JST-to-BST meeting slot to a distributed team so each person sees the event in local time automatically, whether they are in Tokyo, London, or another office connected to the call.
Understanding the JST to BST Time Difference
Japan Standard Time (JST) is UTC+9 all year and does not observe daylight saving time. British Summer Time (BST) is UTC+1 and is used in the United Kingdom during the daylight saving period, which runs from the last Sunday in March to the last Sunday in October. During that BST season, JST is 8 hours ahead of BST.
That means when it is 9:00 AM in London on BST, it is 5:00 PM in Tokyo on JST the same day. In the other direction, when it is 9:00 AM JST, it is 1:00 AM BST on the same calendar day. This large east-west gap matters for teams handling client support, software deployments, and cross-border approvals because the overlap sits mainly in the UK morning and Japan late afternoon.
The difference changes outside the BST season because the UK switches back to Greenwich Mean Time (GMT, UTC+0). From the last Sunday in October until the last Sunday in March, Japan is 9 hours ahead of the UK, not 8. For example, a meeting that is 5:00 PM JST = 9:00 AM BST in July becomes 5:00 PM JST = 8:00 AM GMT in December, which can affect recurring meetings if your team does not review them after the UK clock change.
In practical terms, the JST-to-BST relationship is most relevant from late March through late October, when London operates on BST and many UK businesses run standard office hours around 9 AM to 5 PM. This period often aligns with active collaboration between Japanese headquarters and UK branches in industries such as banking, automotive, gaming, electronics, shipping, and advertising. Airlines also connect these markets through major hubs such as Tokyo Haneda, Tokyo Narita, and London Heathrow, so travelers often use the converter to confirm arrival-day meeting times.
Best Times for Calls and Meetings Between JST and BST
The most workable overlap between standard office hours is usually 4:00 PM to 6:00 PM JST, which equals 8:00 AM to 10:00 AM BST. This window lets London teams start their day while Tokyo teams are still online before the end of business, making it one of the best choices for weekly status calls, executive updates, and customer onboarding sessions.
A slightly later UK-friendly option is 5:00 PM to 7:00 PM JST = 9:00 AM to 11:00 AM BST. This is often better for UK participants who need time to review emails before a meeting, and it still works for Japan-based product, operations, or sales teams that can stay available into early evening.
If you need a broader collaboration block, 3:00 PM to 6:00 PM JST = 7:00 AM to 10:00 AM BST can work for urgent launches or incident response. However, 7:00 AM BST is early for many UK staff, so this range is more realistic for global support teams, financial markets staff, or technical teams handling production issues rather than routine meetings.
Morning in Japan is generally poor for BST participants. For example, 9:00 AM to 11:00 AM JST = 1:00 AM to 3:00 AM BST, which is not practical for normal business calls in the UK. Likewise, a London afternoon meeting such as 2:00 PM BST lands at 10:00 PM JST, which may be acceptable for rare executive discussions but is usually too late for recurring team meetings.
For recurring meetings, many companies settle on 4:30 PM JST / 8:30 AM BST or 5:00 PM JST / 9:00 AM BST because these times avoid extreme hours on both sides. This is especially common for UK-Japan coordination in investment banking, automotive supply chains, localization teams, and multinational software companies that need one dependable handoff point each weekday.
Frequently Asked Questions
What is the time difference between JST and BST?
JST is 8 hours ahead of BST. JST is fixed at UTC+9, while BST is UTC+1 during the UK daylight saving period, so the gap during BST months is always eight hours. For example, 12:00 PM BST is 8:00 PM JST the same day.
When is 9 AM JST in BST?
9:00 AM JST is 1:00 AM BST on the same day. Because Japan is eight hours ahead during the BST season, you subtract eight hours from Tokyo time to get London summer time. This is why early-morning meetings in Japan are usually unsuitable for UK-based participants.
Does the difference between JST and BST change during DST?
Yes, the difference changes because the UK moves between BST (UTC+1) and GMT (UTC+0), while Japan stays on JST (UTC+9) all year. During BST, Japan is 8 hours ahead; during GMT, Japan is 9 hours ahead. The UK typically enters BST on the last Sunday in March and leaves it on the last Sunday in October.
What is the best meeting time between JST and BST?
The best recurring meeting window is usually 4:00 PM to 6:00 PM JST, which equals 8:00 AM to 10:00 AM BST. This period creates the cleanest overlap between normal UK morning office hours and late-afternoon work in Japan. A common compromise for weekly calls is 5:00 PM JST / 9:00 AM BST.
Is London always on BST when comparing with JST?
No, London is only on BST from the last Sunday in March to the last Sunday in October. Outside that period, London uses GMT, and the JST-to-UK difference becomes 9 hours instead of 8. If you are setting a recurring meeting across spring or autumn, you should recheck the schedule around the UK clock change.
How do I convert JST to BST using the xconvert tool?
Open the JST to BST page and use the visual comparison grid rather than typing a time manually. Drag across the JST timeline to select a block, then read the aligned BST row to see the London equivalent instantly; you can then export the result through ICS, Google Calendar, Gmail, Copy to clipboard, or Share link. This is particularly useful for remote teams that need a visual overlap instead of a one-time text conversion.
Why is scheduling between Japan and the UK difficult?
The main challenge is the 8-hour gap during BST and 9-hour gap during GMT, which leaves only a narrow overlap between standard office hours. Japan’s workday starts and ends much earlier relative to the UK, so most practical meetings happen in the late afternoon in Tokyo and morning in London. This affects industries with daily cross-border coordination, including finance, logistics, gaming, and multinational manufacturing.
What time in BST matches 5 PM JST?
5:00 PM JST equals 9:00 AM BST during the British Summer Time period. This is one of the most practical conversion points because it falls squarely inside UK morning office hours and near the end of the Japanese workday. For many UK-Japan teams, this is the default time for standups, handoffs, and client updates.