Offset
The time difference between Greenwich Mean Time and Korea Standard Time is 8 hours.
Greenwich Mean Time (BST) is behind Korea Standard Time (KST).
BST: UTC+1
KST: UTC+9
Greenwich Mean Time is currently observing daylight saving time; Korea Standard Time is not.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Greenwich Mean Time and Korea Standard Time don't overlap on the same weekday. Korea Standard Time is 8 hours ahead of Greenwich Mean Time.
With some flexibility, there’s a workable window outside standard hours:
- 7 AM–12 PM in Greenwich Mean Time (3 PM–8 PM in Korea Standard Time) — suggest 9:00 AM Greenwich Mean Time (5:00 PM Korea Standard Time).
This means an early start or late finish for one side, but it’s a reasonable slot for a one-off meeting.
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
United Kingdom
- Good FridayFri, Apr 3
- Early May Bank HolidayMon, May 4
- Spring Bank HolidayMon, May 25
- Christmas DayFri, Dec 25
- St. Stephen's DayMon, Dec 28
South Korea
- New Year's DayThu, Jan 1
- Lunar New YearMon, Feb 16
- Lunar New YearTue, Feb 17
- Lunar New YearWed, Feb 18
- Independence Movement DayMon, Mar 2
- Labour DayFri, May 1
- Children's DayTue, May 5
- Buddha's BirthdayMon, May 25
- Local Election DayWed, Jun 3
- Memorial DaySat, Jun 6
- Constitution DayFri, Jul 17
- Liberation DayMon, Aug 17
- ChuseokThu, Sep 24
- ChuseokFri, Sep 25
- ChuseokSat, Sep 26
- National Foundation DayMon, Oct 5
- Hangul DayFri, Oct 9
- Christmas DayFri, Dec 25
About these zones
Greenwich Mean Time is also known as GMT, or BST. To call United Kingdom, dial +44.
Korea Standard Time is also known as KST. To call South Korea, dial +82.
Korea Standard Time is approximately 5,500 miles northeast of Greenwich Mean Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| GMT | KST | Day |
|---|---|---|
| 12:00 am | 8:00 am | Same day |
| 1:00 am | 9:00 am | Same day |
| 2:00 am | 10:00 am | Same day |
| 3:00 am | 11:00 am | Same day |
| 4:00 am | 12:00 pm | Same day |
| 5:00 am | 1:00 pm | Same day |
| 6:00 am | 2:00 pm | Same day |
| 7:00 am | 3:00 pm | Same day |
| 8:00 am | 4:00 pm | Same day |
| 9:00 am | 5:00 pm | Same day |
| 10:00 am | 6:00 pm | Same day |
| 11:00 am | 7:00 pm | Same day |
| 12:00 pm | 8:00 pm | Same day |
| 1:00 pm | 9:00 pm | Same day |
| 2:00 pm | 10:00 pm | Same day |
| 3:00 pm | 11:00 pm | Same day |
| 4:00 pm | 12:00 am | +1 day |
| 5:00 pm | 1:00 am | +1 day |
| 6:00 pm | 2:00 am | +1 day |
| 7:00 pm | 3:00 am | +1 day |
| 8:00 pm | 4:00 am | +1 day |
| 9:00 pm | 5:00 am | +1 day |
| 10:00 pm | 6:00 am | +1 day |
| 11:00 pm | 7:00 am | +1 day |
Daylight saving time
Greenwich Mean Time observes daylight saving time; Korea Standard Time does not. The offset between the two zones changes when Greenwich Mean Time transitions: on Sunday, October 25, 2026, clocks fall back from BST to GMT.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 4:47 AM
- Sunset
- 9:13 PM
- Day length
- 16h 25m
- Sunrise
- 5:12 AM
- Sunset
- 7:51 PM
- Day length
- 14h 38m
Daylight overlap: 7h 3m — 4:47 AM–11:51 AM in Greenwich Mean Time (12:47 PM–7:51 PM in Korea Standard Time). Both locations are in daylight during this window.
Cities in these zones
Cities in Greenwich Mean Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Greenwich Mean Time
- LCY
- LGW
- LHR
- LTN
- STN
- BHX
- EMA
- GLA
- PIK
- LBA
Airports in Korea Standard Time
- GMP
- ICN
- PUS
- TAE
- CJJ
- KWJ
- MWX
Related conversions
Common conversions
- What is 9:00 am GMT in KST?
- 9:00 am GMT is 5:00 pm KST.
- What is 12:00 pm GMT in KST?
- 12:00 pm GMT is 8:00 pm KST.
- What is 12:30 pm GMT in KST?
- 12:30 pm GMT is 8:30 pm KST.
- What is 2:00 pm GMT in KST?
- 2:00 pm GMT is 10:00 pm KST.
- What is 5:00 pm GMT in KST?
- 5:00 pm GMT is 1:00 am KST, the next day.
- What is 11:30 pm GMT in KST?
- 11:30 pm GMT is 7:30 am KST, the next day.