No overlap — one side will join outside working hours
GMT (London)
KST (Seoul)
00:00
08:00
01:00
09:00Working
02:00
10:00Working
03:00
11:00Working
04:00
12:00Working
05:00
13:00Working
06:00
14:00Working
07:00
15:00Working
08:00
16:00Working
09:00Working
17:00off
10:00Working
18:00off
11:00Working
19:00off
12:00Working
20:00off
13:00Working
21:00off
14:00Working
22:00off
15:00Working
23:00off
16:00Working
00:00+1doff
17:00
01:00+1d
18:00
02:00+1d
19:00
03:00+1d
20:00
04:00+1d
21:00
05:00+1d
22:00
06:00+1d
23:00
07:00+1d
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between gmt and kst?
Greenwich Mean Time (gmt) is UTC+1 and Korea Standard Time (kst) is UTC+9. The difference between them is 8 hours.
Where is gmt used?
Greenwich Mean Time (gmt) is used in United Kingdom and surrounding regions. The IANA timezone identifier is Europe/London.
Where is kst used?
Korea Standard Time (kst) is used in South Korea and surrounding regions. The IANA timezone identifier is Asia/Seoul.
How do I convert gmt to kst?
Use the interactive converter above. Drag the time slider to any gmt time and the kst equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
GMT (London) to KST (Seoul) — exact time difference
GMT (London) is 8 hours behind KST (Seoul). When GMT (London) clocks hit noon, KST (Seoul) reads 20:00.
GMT (London) observes Europe/London and KST (Seoul) observes Asia/Seoul — a 8 hours gap between them.
Working hours overlap
When GMT (London) is in standard working hours, KST (Seoul) is not — and vice versa. There is no mutual business window between these two locations.
Optimal meeting slots
No business hours overlap exists between GMT (London) and KST (Seoul). Showing the most balanced options with minimal inconvenience for both locations.
08:00 London / 16:00 Seoul⚡ One side off-hours
⚠️ 1h before working hours in London
09:00 London / 17:00 Seoul⚡ One side off-hours
⚠️ 1h after working hours in Seoul
07:00 London / 15:00 Seoul⚡ One side off-hours
⚠️ 2h before working hours in London
Assumes a standard 9 AM–5 PM workday in each location's local timezone.
Holiday calendar for both locations
⚡ Both locations have upcoming holidays, check availability before scheduling.
GMT (London)7 holidays
Jun 15World Cup Bank HolidaySOON
Jul 13Battle of the Boyne
Aug 3Summer Bank Holiday
Aug 31Summer Bank Holiday
Nov 30Saint Andrew's Day
KST (Seoul)7 holidays
Aug 15Liberation Day
Sep 24Chuseok
Sep 25Chuseok
Sep 26Chuseok
Oct 3National Foundation Day
Working across GMT (London) and KST (Seoul)
Working across GMT (London) (United Kingdom) and KST (Seoul) (South Korea) is a challenge — the 8-hour difference means no shared business hours window under a standard schedule. Flexibility from at least one side is required.
💡 Best practice for cross-timezone meetings
⚡
08:00–09:00 in GMT (London) corresponds to 16:00–17:00 in KST (Seoul) (1h before working hours in London).
⚡
09:00–10:00 in GMT (London) corresponds to 17:00–18:00 in KST (Seoul) (1h after working hours in Seoul).
⚡
07:00–08:00 in GMT (London) corresponds to 15:00–16:00 in KST (Seoul) (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 GMT (London) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.
