London to Seoul
+8hLondon
BSTSOURCESeoul
KSTGreen rows indicate typical business hours (9 AM - 5 PM)
BST and KST on the World Map
The map below highlights the BST (Greenwich Mean Time) and KST (Korea Standard Time) timezone regions across the globe.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
- •The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
- •GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
- •Iceland uses GMT year-round and never observes daylight saving time.
- •The UK switches from GMT to BST (British Summer Time) in late March each year.
KST – Korea Standard Time
UTC+09:00Korea Standard Time (KST) is the time zone for South Korea, 9 hours ahead of UTC.
- •South Korea does not observe daylight saving time.
- •Seoul is home to Samsung, LG, and Hyundai headquarters.
- •KST is the same offset as JST (UTC+09:00).
About London
WikipediaLondon, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.
About Seoul
WikipediaSeoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.
Seoul has the fastest average internet speed in the world.
Understanding the +8h Gap: London vs Seoul
London runs on British Summer Time (BST) at UTC+01:00, currently observing daylight saving time. Seoul runs on Korean Standard Time (KST) at UTC+09:00. That puts London 8 hours ahead of Seoul — a difference of +8h at the current offsets.
In practice, when it is 9:00 AM in London it is 5:00 PM in Seoul. Midnight in London is 8:00 AM in Seoul.London observes daylight saving time while Seoul does not, so the gap narrows or widens by an hour part of the year.
London to Seoul time conversion table
| London (BST) | Seoul (KST) | Day |
|---|---|---|
| 12:00 AM | 8:00 AM | 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 |
| 12:00 PM | 8:00 PM | same day |
| 3:00 PM | 11:00 PM | same day |
| 5:00 PM | 1:00 AM | next day |
| 6:00 PM | 2:00 AM | next day |
| 9:00 PM | 5:00 AM | next day |
Why people convert London to Seoul time
- Scheduling a call from London to Seoul: a 10:00 AM start in London lands at 6:00 PM in Seoul, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +8h gap: London and Seoul have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in Seoul is 5:00 PM in London.
- Keeping family and friends in sync: knowing that 8:00 PM in London is 4:00 AM in Seoul makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM BST" is unambiguous; "3 PM" across a +8h gap is not.
- With a +8h gap there is no shared 9-to-5 window, so alternate the early start: one week London takes the early slot, the next week Seoul does.
- London: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +8h gap.
About GMT (Greenwich Mean Time)
Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.
About KST (Korea Standard Time)
Korea Standard Time (KST) is the time zone used in South Korea. It shares the same UTC offset as Japan Standard Time but is a distinct time zone. South Korea does not observe daylight saving time. Seoul, the capital, is a major global tech and business hub.
Best time to call between London and Seoul
With a +8h offset there is no overlap inside a normal 9 AM – 5 PM day. Seoul opens at 9:00 AM KST, which is 5:00 PM in London, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
London and Seoul have no shared working hours because of the +8h gap. Teams need to alternate early starts or rely on asynchronous handovers.
London is 8 hours ahead of Seoul (BST UTC+01:00 → KST UTC+09:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Seoul
Does not observe DST
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between London and Seoul?
London (BST, UTC+01:00) is 8 hours ahead of Seoul (KST, UTC+09:00). The gap is currently +8h.
How do I convert London time to Seoul time?
Add +8h to London local time. For example, 9:00 AM in London is 5:00 PM in Seoul.
What time is it in Seoul right now?
Seoul uses KST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +8h offset from London.
What is the best time to call Seoul from London?
There is no shared working-hours window because of the +8h gap. The closest option is 1:00 PM in London, which is 9:00 PM in Seoul.
Which is ahead, London or Seoul?
London is 8 hours ahead of Seoul. When it is 12:00 PM in London it is 8:00 PM in Seoul.
Do London and Seoul use different time zones?
London (UK) uses BST at UTC+01:00, while Seoul (South Korea) uses KST at UTC+09:00. The IANA identifiers are Europe/London and Asia/Seoul.
Does daylight saving time affect the London–Seoul difference?
Yes at the moment: London is on daylight saving time and Seoul is not, so the +8h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share London's time zone?
BST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.
Which countries use BST, London's zone?
BST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.
Is there a day difference between London and Seoul?
Not normally. The +8h gap only pushes the date over for late-evening times.
What is the time difference between London and Seoul?
Seoul is +8h from London.
What timezone is London in?
London, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
What timezone is Seoul in?
Seoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
What are the business hours in Seoul?
Standard business hours in Seoul are 9:00 AM - 6:00 PM KST.
What is the best time to schedule a call between London and Seoul?
The best overlap for a call is when both cities are in business hours. London works 9:00 AM - 5:00 PM GMT and Seoul works 9:00 AM - 6:00 PM KST (+8h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in London and Seoul?
London uses GBP (£) while Seoul uses KRW (₩). Check current exchange rates when planning travel or business between these cities.
How do London and Seoul compare in size?
London has a population of approximately 8.8 million (metro: 14.8 million), while Seoul has approximately 9.7 million (metro: 25.5 million).
What are the major landmarks in London and Seoul?
London is known for Big Ben, Tower Bridge, Buckingham Palace. Seoul is famous for Gyeongbokgung Palace, N Seoul Tower, Bukchon Hanok Village.
Do London and Seoul have stock exchanges?
Yes. London has the LSE (London Stock Exchange) and Seoul has the KRX (Korea Exchange). The +8h time difference affects trading hour overlaps between these exchanges.
Which countries use GMT (Greenwich Mean Time)?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.
Does GMT observe daylight saving time?
Yes, GMT switches to BST during summer months.
What are some interesting facts about GMT?
GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
Which cities are in the KST timezone?
Major cities in the KST timezone include Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
What is the UTC offset for KST?
Korea Standard Time (KST) is at UTC+09:00.
What should I know about the KST timezone?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
When is it midnight in London, what time is it in Seoul?
When it is 12:00 AM (midnight) in London (GMT), it is +8h later in Seoul (KST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More London time conversions
- london to gmt
- london to bst
- london to uk
- london to dublin
- london to paris
- london to berlin
- london to amsterdam
- london to madrid
- london to rome
- london to zurich
- london to stockholm
- london to moscow
- london to istanbul
- london to lisbon
- london to warsaw
- london to new york
- london to dubai
- london to tokyo
- london to singapore
- london to sydney
- london to los angeles
- london to delhi
- london to mumbai
- london to hong kong
- london to toronto
- london to kathmandu
- new york to london
- dubai to london
- tokyo to london
- singapore to london
- sydney to london
- los angeles to london
- paris to london
- delhi to london
- mumbai to london
- berlin to london
See every conversion from London →·See every conversion from Seoul →