GMT to South Korea
+9hGMT
GMTSOURCESouth Korea
KSTGreen rows indicate typical business hours (9 AM - 5 PM)
GMT and KST on the World Map
The map below highlights the GMT (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).
GMT vs South Korea: Offsets, DST and Best Call Times
GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. South Korea runs on Korean Standard Time (KST) at UTC+09:00. That puts GMT 9 hours ahead of South Korea — a difference of +9h at the current offsets.
In practice, when it is 9:00 AM in GMT it is 6:00 PM in South Korea. Midnight in GMT is 9:00 AM in South Korea. Neither zone observes daylight saving time, so the offset between them stays constant all year.
GMT to South Korea time conversion table
| GMT (GMT) | South Korea (KST) | Day |
|---|---|---|
| 12:00 AM | 9:00 AM | same day |
| 6:00 AM | 3:00 PM | same day |
| 7:00 AM | 4:00 PM | same day |
| 8:00 AM | 5:00 PM | same day |
| 9:00 AM | 6:00 PM | same day |
| 12:00 PM | 9:00 PM | same day |
| 3:00 PM | 12:00 AM | next day |
| 5:00 PM | 2:00 AM | next day |
| 6:00 PM | 3:00 AM | next day |
| 9:00 PM | 6:00 AM | next day |
Why people convert GMT to South Korea time
- Scheduling a call from GMT to South Korea: a 10:00 AM start in GMT lands at 7:00 PM in South Korea, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +9h gap: GMT and South Korea 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 South Korea is 6:00 PM in GMT.
- Watching a live event or market open: GMT viewers need 6:00 PM in South Korea to catch a 9:00 AM start there, and 3:00 PM if the event is anchored to GMT.
- Always state the zone abbreviation, not just the hour. "3:00 PM GMT" is unambiguous; "3 PM" across a +9h gap is not.
- With a +9h gap there is no shared 9-to-5 window, so alternate the early start: one week GMT takes the early slot, the next week South Korea does.
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 GMT and South Korea
With a +9h offset there is no overlap inside a normal 9 AM – 5 PM day. South Korea opens at 9:00 AM KST, which is 6:00 PM in GMT, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
GMT and South Korea have no shared working hours because of the +9h gap. Teams need to alternate early starts or rely on asynchronous handovers.
GMT is 9 hours ahead of South Korea (GMT UTC+00:00 → 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
GMT
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
South Korea
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 GMT and South Korea?
GMT (GMT, UTC+00:00) is 9 hours ahead of South Korea (KST, UTC+09:00). The gap is currently +9h.
How do I convert GMT time to South Korea time?
Add +9h to GMT local time. For example, 9:00 AM in GMT is 6:00 PM in South Korea.
What time is it in South Korea right now?
South Korea 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 +9h offset from GMT.
What is the best time to call South Korea from GMT?
There is no shared working-hours window because of the +9h gap. The closest option is 1:00 PM in GMT, which is 10:00 PM in South Korea.
Which is ahead, GMT or South Korea?
GMT is 9 hours ahead of South Korea. When it is 12:00 PM in GMT it is 9:00 PM in South Korea.
Do GMT and South Korea use different time zones?
GMT uses GMT at UTC+00:00, while South Korea (South Korea) uses KST at UTC+09:00. The IANA identifiers are Europe/London and Asia/Seoul.
Does daylight saving time affect the GMT–South Korea difference?
Neither zone observes daylight saving time, so the +9h offset between GMT and South Korea is fixed all year.
Which other cities share GMT's time zone?
GMT also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.
Which countries use GMT, GMT's zone?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.
Is there a day difference between GMT and South Korea?
Not normally. The +9h gap only pushes the date over for late-evening times.
What is the time difference between GMT and South Korea?
South Korea is +9h from GMT.
What timezone is GMT in?
GMT operates on its local timezone.
What timezone is South Korea in?
South Korea operates on its local timezone.
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 GMT, what time is it in South Korea?
When it is 12:00 AM (midnight) in GMT (GMT), it is +9h later in South Korea (KST).
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