Convert BST to JST
See the 8-hour time difference between BST and JST, compare hours side by side, and schedule meetings with calendar export tools.
How to Convert BST to JST
Open the BST to JST converter: Go to https://www.xconvert.com/time-converter/bst-to-jst-converter. The page is set up for British Summer Time and Japan Standard Time, which is useful when you are scheduling a client call between London and Tokyo, confirming a handoff between a UK product team and a Japan-based engineering partner, or checking webinar times for audiences in both markets.
Add relevant comparison cities: Click + Add City and search for cities such as London, Tokyo, and optionally Singapore or New York if your team also works across APAC or North America. This is especially practical for finance, gaming, automotive, and electronics companies that often coordinate between the UK, Japan, and other regional hubs during product launches, market opens, or supplier meetings.
Drag to select a meeting window: Use the Select button if needed, then drag across the BST row on the 24-hour grid 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, drag from 9:00 AM to 11:00 AM BST and you will see that this equals 5:00 PM to 7:00 PM JST, which is often workable for a same-day business call, while 2:00 PM BST becomes 10:00 PM JST, usually too late for standard office hours in Tokyo.
Export and share the result: After selecting a range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is useful when you need to send a confirmed cross-border meeting to a distributed team so each person sees the event in local time automatically, whether they are in London, Tokyo, or another office.
Understanding the BST to JST Time Difference
British Summer Time is UTC+1, while Japan Standard Time is UTC+9, so JST is 8 hours ahead of BST. That means when it is 9:00 AM BST, it is 5:00 PM JST the same day, and when it is 12:00 PM BST, it is 8:00 PM JST. This fixed 8-hour gap applies only while the UK is observing BST.
The BST period in the UK runs from the last Sunday in March to the last Sunday in October. In 2025, BST begins on 30 March 2025 and ends on 26 October 2025; during that span, the UK moves one hour ahead of GMT. Japan does not observe daylight saving time, so Japan remains on JST (UTC+9) all year, including in major cities such as Tokyo, Osaka, Yokohama, Nagoya, and Sapporo.
Because Japan stays on the same offset year-round, the BST-to-JST difference changes only when the UK switches between summer and winter time. During BST months, the difference is 8 hours; during the UK winter on GMT (UTC+0), Japan is 9 hours ahead instead. This matters for recurring meetings: a call set for 9:00 AM London time becomes 5:00 PM Tokyo time in summer, but 6:00 PM Tokyo time in winter.
This seasonal shift is important for industries with regular UK-Japan coordination, including banking, automotive manufacturing, shipping, consumer electronics, and gaming. London-based teams working with Tokyo offices often prefer stable UTC-based scheduling for quarterly reviews, supplier updates, and market briefings, because the local-time relationship changes once in spring and once in autumn on the UK side only.
Best Times for Calls and Meetings Between BST and JST
The most practical overlap for standard office hours is usually 9:00 AM to 10:00 AM BST = 5:00 PM to 6:00 PM JST and 10:00 AM to 11:00 AM BST = 6:00 PM to 7:00 PM JST. This window lets UK teams start meetings in the morning while Japan participants join before the end of a typical business day, making it one of the best choices for account reviews, project check-ins, and legal or procurement discussions.
A slightly later option is 11:00 AM BST = 7:00 PM JST and 12:00 PM BST = 8:00 PM JST. This can still work for senior stakeholders, external partners, or teams in industries like media, consulting, and international sales, but it is already outside normal office hours for many employees in Japan, so it is better used for occasional meetings rather than daily standups.
Very early UK meetings can create a stronger overlap with Japan’s afternoon. For example, 8:00 AM BST = 4:00 PM JST, which is often ideal for same-day operational coordination, especially if a UK logistics, trading, or support team needs decisions from Tokyo before the Japan office closes. By contrast, 2:00 PM BST = 10:00 PM JST and 4:00 PM BST = 12:00 AM JST the next day, which are generally unsuitable except for urgent production incidents or executive-level calls.
If you need recurring meetings, a narrow shared window of 8:00 AM to 10:00 AM BST = 4:00 PM to 6:00 PM JST is usually the most sustainable. For remote teams, this means the UK side meets at the start of the day while Japan joins late afternoon to early evening, which is more realistic than trying to place a meeting in the UK afternoon when Japan is already in late evening or past midnight.
For travel and event planning, the 8-hour difference also affects flight coordination and arrival communication. A departure update sent at 1:00 PM BST reaches colleagues in Japan at 9:00 PM JST, so hotel check-ins, airport transfers, and customer meetings in Tokyo are easier to manage when messages are sent during the UK morning rather than later in the day.
Frequently Asked Questions
What is the time difference between BST and JST?
During British Summer Time, JST is 8 hours ahead of BST. BST is UTC+1 and JST is UTC+9, so you add 8 hours when converting from BST to JST. For example, 9:00 AM BST becomes 5:00 PM JST, and 3:00 PM BST becomes 11:00 PM JST.
When is 9 AM BST in JST?
9:00 AM BST is 5:00 PM JST on the same calendar day. This is one of the most commonly used conversion points because it falls within normal morning hours in the UK and late afternoon in Japan, making it practical for cross-border business calls and project updates.
Does the difference between BST and JST change during DST?
Yes, but the change happens because of the UK, not Japan. Japan does not use daylight saving time, so it remains on UTC+9 all year; when the UK is on BST, Japan is 8 hours ahead, and when the UK returns to GMT in late October, Japan becomes 9 hours ahead of the UK.
Which months have an 8-hour difference between BST and JST?
The 8-hour difference applies during the UK’s BST period, from the last Sunday in March to the last Sunday in October. In 2025, that means from 30 March 2025 through 26 October 2025. Outside those dates, the UK uses GMT and the gap increases to 9 hours.
What is the best meeting time between BST and JST?
The best regular meeting window is usually 8:00 AM to 10:00 AM BST, which equals 4:00 PM to 6:00 PM JST. A very common compromise is 9:00 AM BST = 5:00 PM JST, because it stays within standard office hours for both sides and avoids pushing Japan participants too far into the evening.
How do I convert BST to JST on https://www.xconvert.com?
On the converter page, you use the visual comparison grid rather than typing a time into a field. Add any extra cities you need with + Add City, click Select, and drag across the BST timeline to highlight the hours you want; the JST row updates visually so you can immediately see the matching time in Japan, then export the selection through ICS, Google Calendar, Gmail, Copy to clipboard, or Share link.
Is Tokyo always on JST?
Yes, Tokyo uses Japan Standard Time (UTC+9) throughout the year. Japan does not switch to daylight saving time, so the local time in Tokyo stays consistent, which simplifies scheduling compared with the UK, where the offset changes between BST in summer and GMT in winter.
Why is scheduling BST to JST meetings difficult in the afternoon?
The challenge is that Japan is already far ahead in the day. For example, 1:00 PM BST = 9:00 PM JST and 3:00 PM BST = 11:00 PM JST, so a normal UK afternoon quickly becomes late evening in Japan. That is why most recurring UK-Japan meetings are placed in the UK morning instead of after lunch.