No overlap — one side will join outside working hours
KST (Seoul)
GMT (London)
00:00
16:00-1dWorking
01:00
17:00-1d
02:00
18:00-1d
03:00
19:00-1d
04:00
20:00-1d
05:00
21:00-1d
06:00
22:00-1d
07:00
23:00-1d
08:00
00:00
09:00Working
01:00off
10:00Working
02:00off
11:00Working
03:00off
12:00Working
04:00off
13:00Working
05:00off
14:00Working
06:00off
15:00Working
07:00off
16:00Working
08:00off
17:00
09:00Working
18:00
10:00Working
19:00
11:00Working
20:00
12:00Working
21:00
13:00Working
22:00
14:00Working
23:00
15:00Working
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between kst and gmt?
Korea Standard Time (kst) is UTC+9 and Greenwich Mean Time (gmt) is UTC+1. The difference between them is 8 hours.
Where is kst used?
Korea Standard Time (kst) is used in South Korea and surrounding regions. The IANA timezone identifier is Asia/Seoul.
Where is gmt used?
Greenwich Mean Time (gmt) is used in United Kingdom and surrounding regions. The IANA timezone identifier is Europe/London.
How do I convert kst to gmt?
Use the interactive converter above. Drag the time slider to any kst time and the gmt equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
KST (Seoul) is 8 hours ahead of GMT (London). Midday in KST (Seoul) lines up with 04:00 in GMT (London).
KST (Seoul) observes Asia/Seoul and GMT (London) observes Europe/London — a 8 hours gap between them.
Daily overlap window
When KST (Seoul) is in standard working hours, GMT (London) is not — and vice versa. There is no mutual business window between these two locations.
Optimal meeting slots
No business hours overlap exists between KST (Seoul) and GMT (London). Showing the most balanced options with minimal inconvenience for both locations.
16:00 Seoul / 08:00 London⚡ One side off-hours
⚠️ 1h before working hours in London
17:00 Seoul / 09:00 London⚡ One side off-hours
⚠️ 1h after working hours in Seoul
15:00 Seoul / 07:00 London⚡ One side off-hours
⚠️ 2h before working hours in London
Assumes a standard 9 AM–5 PM workday in each location's local timezone.
Upcoming public holidays
⚡ Watch out — upcoming holidays on both sides. Verify availability in advance.
KST (Seoul)7 holidays
Aug 15Liberation Day
Sep 24Chuseok
Sep 25Chuseok
Sep 26Chuseok
Oct 3National Foundation Day
GMT (London)6 holidays
Jul 13Battle of the Boyne
Aug 3Summer Bank Holiday
Aug 31Summer Bank Holiday
Nov 30Saint Andrew's Day
Dec 25Christmas Day
How to work with KST (Seoul) and GMT (London) time zones
Coordinating between KST (Seoul) (South Korea) and GMT (London) (United Kingdom) means working around a 8-hour time difference. Since standard business hours don't naturally overlap, meetings usually require one side to shift slightly outside their normal working day.
💡 How to schedule across these time zones
⚡
16:00–17:00 in KST (Seoul) corresponds to 08:00–09:00 in GMT (London) (1h before working hours in London).
⚡
17:00–18:00 in KST (Seoul) corresponds to 09:00–10:00 in GMT (London) (1h after working hours in Seoul).
⚡
15:00–16:00 in KST (Seoul) corresponds to 07:00–08:00 in GMT (London) (2h before working hours in London).
Since there is no natural overlap, the options above represent the most balanced compromise, minimizing out-of-hours inconvenience for both sides.
Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.
Drag the slider at the top to convert any KST (Seoul) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.
