South Korea to Ireland
-8hSouth Korea
KSTSOURCEIreland
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and IST on the World Map
The map below highlights the KST (Korea Standard Time) and IST (Greenwich Mean Time) timezone regions across the globe.
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 – 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.
Everything You Need to Know About South Korea and Ireland Time
South Korea runs on Korean Standard Time (KST) at UTC+09:00. Ireland runs on Irish Standard Time (IST) at UTC+01:00, also currently on daylight saving time. That puts South Korea 8 hours behind Ireland — a difference of -8h at the current offsets.
In practice, when it is 9:00 AM in South Korea it is 1:00 AM in Ireland. Midnight in South Korea is 4:00 PM in Ireland.Ireland observes daylight saving time while South Korea does not, so the gap narrows or widens by an hour part of the year.
South Korea to Ireland time conversion table
| South Korea (KST) | Ireland (IST) | Day |
|---|---|---|
| 12:00 AM | 4:00 PM | previous day |
| 6:00 AM | 10:00 PM | previous day |
| 7:00 AM | 11:00 PM | previous day |
| 8:00 AM | 12:00 AM | same day |
| 9:00 AM | 1:00 AM | same day |
| 12:00 PM | 4:00 AM | same day |
| 3:00 PM | 7:00 AM | same day |
| 5:00 PM | 9:00 AM | same day |
| 6:00 PM | 10:00 AM | same day |
| 9:00 PM | 1:00 PM | same day |
Why people convert South Korea to Ireland time
- Scheduling a call from South Korea to Ireland: a 10:00 AM start in South Korea lands at 2:00 AM in Ireland, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -8h gap: South Korea and Ireland 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 Ireland is 1:00 AM in South Korea.
- Booking travel or deliveries: tracking Ireland local time against South Korea keeps pickup windows and arrival estimates honest across the -8h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM KST" 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 South Korea takes the early slot, the next week Ireland does.
- Ireland: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
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.
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.
Best time to call between South Korea and Ireland
With a -8h offset there is no overlap inside a normal 9 AM – 5 PM day. Ireland opens at 9:00 AM IST, which is 1:00 AM in South Korea, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
South Korea and Ireland have no shared working hours because of the -8h gap. Teams need to alternate early starts or rely on asynchronous handovers.
South Korea is 8 hours behind Ireland (KST UTC+09:00 → IST UTC+01:00). 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
South Korea
Does not observe DST
Ireland
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
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 South Korea and Ireland?
South Korea (KST, UTC+09:00) is 8 hours behind Ireland (IST, UTC+01:00). The gap is currently -8h.
How do I convert South Korea time to Ireland time?
Add -8h to South Korea local time. For example, 9:00 AM in South Korea is 1:00 AM in Ireland.
What time is it in Ireland right now?
Ireland uses IST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -8h offset from South Korea.
What is the best time to call Ireland from South Korea?
There is no shared working-hours window because of the -8h gap. The closest option is 1:00 PM in South Korea, which is 5:00 AM in Ireland.
Which is behind, South Korea or Ireland?
South Korea is 8 hours behind Ireland. When it is 12:00 PM in South Korea it is 4:00 AM in Ireland.
Do South Korea and Ireland use different time zones?
South Korea (South Korea) uses KST at UTC+09:00, while Ireland (Ireland) uses IST at UTC+01:00. The IANA identifiers are Asia/Seoul and Europe/Dublin.
Does daylight saving time affect the South Korea–Ireland difference?
Yes at the moment: Ireland is on daylight saving time and South Korea is not, so the -8h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share South Korea's time zone?
KST also covers Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
Which countries use KST, South Korea's zone?
KST is used in South Korea, North Korea.
Is there a day difference between South Korea and Ireland?
Not normally. The -8h gap only pushes the date over the previous day.
What is the time difference between South Korea and Ireland?
Ireland is -8h from South Korea.
What timezone is South Korea in?
South Korea operates on its local timezone.
What timezone is Ireland in?
Ireland operates on its local timezone.
Which countries use KST (Korea Standard Time)?
KST is used in South Korea, North Korea.
Does KST observe daylight saving time?
No, KST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about KST?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
Which cities are in the GMT timezone?
Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.
What is the UTC offset for GMT?
Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.
What should I know about the GMT timezone?
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.
When is it midnight in South Korea, what time is it in Ireland?
When it is 12:00 AM (midnight) in South Korea (KST), it is -8h later in Ireland (GMT).
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