Compare BST vs JST
See the 8-hour time difference between BST and JST, understand daylight saving effects, and find practical meeting times.
How to Find the Time Difference Between BST and JST
Open the BST vs JST converter page: Go to https://www.xconvert.com/time-converter/bst-vs-jst to load a visual comparison grid with BST and JST already shown as separate rows. This page is useful when you are scheduling a London–Tokyo client call, coordinating a software release between a UK product team and a Japan engineering team, or checking whether a shipment update will land during business hours in both markets.
Add comparison cities relevant to your work: Click + Add City and add cities such as London, Tokyo, and optionally Singapore or New York if your team also works across finance, logistics, or customer support hubs. For example, London is a major center for banking, legal, and media operations, while Tokyo is critical for automotive, electronics, gaming, and regional Asia-Pacific headquarters, so adding both city rows helps you compare actual working windows instead of relying only on abbreviations.
Drag across the grid to select a meeting window: Click Select if needed, then drag across the colored timeline on the BST row to highlight a range such as 9:00 AM to 11:00 AM BST; the JST row will immediately show that as 5:00 PM to 7:00 PM JST on the same day. This is a practical overlap for commercial calls, because it lands inside normal office hours in the UK and near the end of the business day in Japan, while a later UK slot such as 2:00 PM BST becomes 10:00 PM JST, which is usually too late for regular team meetings.
Export and share the selected time: After selecting a range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link depending on how you coordinate with others. An ICS file is useful for sending a confirmed meeting to a distributed team, Google Calendar works well for internal scheduling, Gmail helps when emailing a Tokyo client directly, and a share link is convenient when you want colleagues in both time zones to review the exact overlap without recalculating it manually.
BST vs JST Offset Explained
BST (British Summer Time) is UTC+1, while JST (Japan Standard Time) is UTC+9, so JST is exactly 8 hours ahead of BST. That means when it is 9:00 AM in BST, it is 5:00 PM in JST on the same calendar day. This same-day relationship is important for business planning because Japan’s workday is already well advanced by the time the UK morning begins.
BST is not a year-round time zone; it is the UK’s daylight saving time used during the warmer part of the year. In the UK, BST begins on the last Sunday in March when clocks move forward from GMT (UTC+0) to BST (UTC+1), and it ends on the last Sunday in October when clocks move back to GMT. In 2025, BST starts on 30 March 2025 and ends on 26 October 2025, so the BST vs JST difference of 8 hours applies only during that period.
Japan does not observe daylight saving time, so JST remains UTC+9 all year. Because of that, the UK–Japan time difference changes seasonally: during BST, Japan is 8 hours ahead, but during GMT, Japan is 9 hours ahead. For example, 9:00 AM in London is 5:00 PM in Tokyo during BST, but 6:00 PM in Tokyo during GMT.
This seasonal shift matters for recurring meetings, especially for industries with fixed weekly schedules such as finance, consulting, SaaS support, manufacturing, and media distribution. A standing call set for 8:00 AM London time becomes 4:00 PM Tokyo time in summer, but 5:00 PM Tokyo time in winter, which can push a previously comfortable overlap closer to end-of-day for Japanese teams.
For practical scheduling, the strongest overlap usually falls in the UK morning and early afternoon, which corresponds to the late afternoon and evening in Japan. A common window is 8:00 AM to 11:00 AM BST = 4:00 PM to 7:00 PM JST, which works for project updates, supplier coordination, and regional management calls. By contrast, 3:00 PM BST = 11:00 PM JST, making late UK meetings unsuitable for normal Tokyo office hours unless the discussion is urgent.
Frequently Asked Questions
What is the exact time difference between BST and JST?
JST is 8 hours ahead of BST. If it is 10:00 AM BST, it is 6:00 PM JST on the same day, which makes UK mornings the most practical time for live collaboration with Japan.
Does Japan change clocks for daylight saving time?
No, Japan uses Japan Standard Time (UTC+9) throughout the entire year and does not switch to daylight saving time. This means the only seasonal change in the UK–Japan time gap comes from the UK moving between GMT and BST, not from any change in Japan.
Why does the BST to JST time difference change during the year?
The difference changes because BST is seasonal, while JST is fixed. During the UK summer daylight saving period, Japan is 8 hours ahead; outside that period, when the UK returns to GMT, Japan becomes 9 hours ahead, so recurring meetings may need adjustment in spring and autumn.
What is the best meeting time between BST and JST for work calls?
For most teams, the best overlap is 8:00 AM to 11:00 AM BST, which corresponds to 4:00 PM to 7:00 PM JST. This range is commonly used for software standups, client reviews, manufacturing updates, and regional operations calls because it avoids very early starts in the UK and very late nights in Japan.
If it is 9 AM BST, what time is it in JST?
When it is 9:00 AM BST, it is 5:00 PM JST the same day. This is one of the clearest examples of the 8-hour gap and shows why a standard UK morning meeting often lands near the end of the Japanese business day.
Is BST the same as London time?
BST is London time only during the UK daylight saving period, typically from the last Sunday in March to the last Sunday in October. Outside that period, London uses GMT (UTC+0), so anyone scheduling with Tokyo should confirm whether the UK is currently on BST or GMT before sending invitations.
How do I schedule a recurring meeting between the UK and Japan without mistakes?
Use a visual converter and check the date of each meeting, especially around the UK clock changes in March and October. On the xconvert grid, select the meeting range visually, verify how it appears in both BST and JST, and export it through Google Calendar, ICS, Gmail, Copy to clipboard, or Share link so every participant sees the correct local time automatically.
Is there any same-day overlap for normal office hours in BST and JST?
Yes, but it is limited and usually favors the UK morning. For example, 9:00 AM to 10:00 AM BST equals 5:00 PM to 6:00 PM JST, which is still workable for many corporate teams in Tokyo, while anything much later in the UK quickly moves into late evening in Japan.