Compare BST and KST
See the current time difference between BST and KST, how daylight saving affects the gap, and the best hours to schedule meetings.
How to Find the Time Difference Between BST and KST
Open the BST to KST converter: Go to https://www.xconvert.com/time-converter/bst-vs-kst. The page loads with BST and KST already shown in the visual comparison grid, which is useful if you are scheduling a call between the UK and South Korea for software delivery, electronics sourcing, gaming operations, or media coordination.
Add comparison cities relevant to your schedule: Click + Add City and add cities such as London, Seoul, and Singapore or New York if your team spans multiple offices. This is especially helpful for companies working across UK finance, Korean manufacturing, and Asia-Pacific support teams, because you can see whether one meeting window works across all locations without manually calculating offsets.
Drag across the grid to compare a meeting window: Click Select if needed, then drag on the BST row from 9:00 AM to 11:00 AM BST to create a purple selection. You will immediately see that this corresponds to 5:00 PM to 7:00 PM KST on the same day, which makes late-afternoon Seoul meetings practical for UK morning calls but less suitable if your Korean team finishes around 6 PM local time.
Export and share the selected time: After selecting the range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is useful when sending a confirmed meeting slot to a London-based client and a Seoul operations team, because each person receives the event in their own local time without needing to recheck the BST to KST conversion.
BST vs KST Offset Explained
BST (British Summer Time) is UTC+1, while KST (Korea Standard Time) is UTC+9, so KST is 8 hours ahead of BST. That means when it is 9:00 AM in BST, it is 5:00 PM in KST, and when it is 3:00 PM in BST, it is 11:00 PM in KST. For real-world scheduling, this creates a narrow same-day overlap that usually falls in the UK morning to early afternoon and the Korean late afternoon to evening.
The key seasonal detail is that BST is itself a daylight saving time period, not the UK’s year-round standard time. In the United Kingdom, clocks move forward by 1 hour on the last Sunday in March and move back by 1 hour on the last Sunday in October; for example, in 2025, BST begins on 30 March 2025 and ends on 26 October 2025. South Korea does not observe daylight saving time, so KST remains UTC+9 all year, which means the BST-to-KST difference stays at 8 hours only during the BST season.
Outside the BST period, the UK uses GMT (UTC+0) instead of BST, and the difference to KST becomes 9 hours. This matters for recurring meetings: a call set for 10:00 AM UK time will be 6:00 PM in Seoul during BST, but 7:00 PM in Seoul during GMT. Teams in industries such as banking, e-commerce, semiconductors, shipping, and entertainment often need to adjust recurring calendars in late March and late October so Korean colleagues do not unexpectedly receive meetings an hour later.
Because South Korea’s business center is Seoul, a metropolitan area of roughly 9.4 million people in the city and over 25 million in the wider capital region, KST scheduling often reflects office hours for major companies in technology, automotive, consumer electronics, and gaming. UK-based teams working with Korean partners such as suppliers, publishers, or regional headquarters often aim for 8:00 AM to 11:00 AM BST, which maps to 4:00 PM to 7:00 PM KST. That range is often the most practical overlap for approvals, client presentations, and cross-border handoffs.
Frequently Asked Questions
What is the exact time difference between BST and KST?
KST is 8 hours ahead of BST. If it is 8:00 AM in BST, it is 4:00 PM in KST the same day. This same-day relationship makes UK morning meetings the most practical option for coordination with South Korea, especially for product teams, sourcing managers, and regional support staff.
Is Korea always 8 hours ahead of British time?
No, South Korea is always 8 hours ahead of BST specifically, but not always 8 hours ahead of UK local time year-round. During the UK winter, the UK switches back to GMT (UTC+0), so Korea becomes 9 hours ahead instead. This is one of the most common causes of missed recurring meetings between London and Seoul after the October clock change.
Does South Korea use daylight saving time?
No, South Korea uses KST (UTC+9) all year and does not currently observe daylight saving time. That means all seasonal movement comes from the UK side, not the Korean side. If your company runs fixed monthly meetings with Korean clients or suppliers, you only need to watch the UK clock changes in March and October.
When is the best meeting time between BST and KST?
The best overlap is usually 8:00 AM to 11:00 AM BST, which corresponds to 4:00 PM to 7:00 PM KST. This window works well for commercial discussions, engineering handoffs, and account management because it stays within normal UK office hours while still reaching Seoul before the end of the local workday. A 1:00 PM BST meeting, for example, becomes 9:00 PM KST, which is often too late for routine business calls.
How do I convert 9 AM BST to Korea time?
To convert 9:00 AM BST to Korea time, add 8 hours, which gives 5:00 PM KST on the same day. This is a useful benchmark because many UK teams start their day around 9 AM, while Korean counterparts are already in the late afternoon. If you are planning a daily sync, this conversion shows why early UK meetings are usually better than late UK meetings.
Why does the BST to KST difference change during the year?
The difference changes because BST is seasonal daylight saving time in the UK, while KST stays fixed at UTC+9. During BST, Korea is 8 hours ahead; during GMT, Korea is 9 hours ahead. In practical terms, a meeting that feels manageable in July may become noticeably later for Seoul participants in November unless the schedule is adjusted.
Is BST the same as London time?
BST is London time only during the daylight saving period, typically from the last Sunday in March to the last Sunday in October. For the rest of the year, London uses GMT, not BST. If you are arranging calls with Seoul and selecting “London” on a world clock, always check whether the date falls in BST or GMT so the Korean side does not end up an hour off.
What working hours overlap between the UK and South Korea during BST?
A realistic overlap during BST is about 8:00 AM to 10:00 AM or 11:00 AM BST, which equals 4:00 PM to 6:00 PM or 7:00 PM KST. This overlap is commonly used for legal reviews, procurement calls, game publishing coordination, and executive updates between UK and Korean teams. After that point, Korean local time moves into late evening, which is less suitable for regular collaboration.