Colombo to Seoul
+3h 30mColombo
ISTSOURCESeoul
KSTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and KST on the World Map
The map below highlights the IST (India Standard Time) and KST (Korea Standard Time) timezone regions across the globe.
IST – India Standard Time
UTC+05:30India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.
- •India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT.
- •India uses a single time zone despite spanning 30° of longitude.
- •IST is one of only a handful of time zones with a 30-minute offset.
- •IST is the most populous single time zone in the world with over 1.4 billion people.
- •The Bombay Stock Exchange (BSE) and National Stock Exchange (NSE) operate on IST.
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 Colombo
WikipediaColombo operates on Sri Lanka Time (SLST), UTC+5:30. Sharing India's timezone, Colombo is a key South Asian trade and tourism hub.
Sri Lanka Standard Time (SLST) uses UTC+5:30, same offset as India.
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.
Comparing Time Zones: Colombo and Seoul
Colombo runs on India Standard Time (IST) at UTC+05:30. Seoul runs on Korean Standard Time (KST) at UTC+09:00. That puts Colombo 3 hours 30 minutes ahead of Seoul — a difference of +3h 30m at the current offsets.
In practice, when it is 9:00 AM in Colombo it is 12:30 PM in Seoul. Midnight in Colombo is 3:30 AM in Seoul. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Colombo to Seoul time conversion table
| Colombo (IST) | Seoul (KST) | Day |
|---|---|---|
| 12:00 AM | 3:30 AM | same day |
| 6:00 AM | 9:30 AM | same day |
| 7:00 AM | 10:30 AM | same day |
| 8:00 AM | 11:30 AM | same day |
| 9:00 AM | 12:30 PM | same day |
| 12:00 PM | 3:30 PM | same day |
| 3:00 PM | 6:30 PM | same day |
| 5:00 PM | 8:30 PM | same day |
| 6:00 PM | 9:30 PM | same day |
| 9:00 PM | 12:30 AM | next day |
Why people convert Colombo to Seoul time
- Scheduling a call from Colombo to Seoul: a 10:00 AM start in Colombo lands at 1:30 PM in Seoul, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Colombo and Seoul are inside the 9-to-5 working day between 9:00 AM and 1:30 PM IST time (12:30 PM–5:00 PM KST). That is roughly 4 hours 30 minutes of usable overlap.
- Booking travel or deliveries: tracking Seoul local time against Colombo keeps pickup windows and arrival estimates honest across the +3h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a +3h 30m gap is not.
- Block 9:00 AM–1:30 PM IST as the recurring meeting window if you work primarily from Colombo and need Seoul colleagues present.
About IST (India Standard Time)
India Standard Time (IST) is the time observed throughout India and Sri Lanka. It is based on the 82.5°E meridian, passing through Mirzapur in Uttar Pradesh. India uses a single time zone despite spanning roughly 30° of longitude, which has been debated. IST does not observe daylight saving time. India is the world's most populous country, making IST one of the most-used time zones globally. The IT outsourcing industry and call centers operate primarily on IST, making the EST-to-IST conversion one of the most searched timezone conversions.
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 Colombo and Seoul
Both Colombo and Seoul sit inside the 9 AM – 5 PM working day between 9:00 AM–1:30 PM IST, which is 12:30 PM–5:00 PM KST. That gives roughly 4 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Colombo and Seoul overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
Colombo is 3 hours 30 minutes ahead of Seoul (IST UTC+05:30 → KST UTC+09:00). The shared working window is 9:00 AM–1:30 PM IST. Remember to re-check around daylight-saving transitions.
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 Colombo and Seoul?
Colombo (IST, UTC+05:30) is 3 hours 30 minutes ahead of Seoul (KST, UTC+09:00). The gap is currently +3h 30m.
How do I convert Colombo time to Seoul time?
Add +3h 30m to Colombo local time. For example, 9:00 AM in Colombo is 12:30 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 +3h 30m offset from Colombo.
What is the best time to call Seoul from Colombo?
Call between 9:00 AM and 1:30 PM IST — that maps to 12:30 PM–5:00 PM KST and keeps both parties inside the working day.
Which is ahead, Colombo or Seoul?
Colombo is 3 hours 30 minutes ahead of Seoul. When it is 12:00 PM in Colombo it is 3:30 PM in Seoul.
Do Colombo and Seoul use different time zones?
Colombo (Sri Lanka) uses IST at UTC+05:30, while Seoul (South Korea) uses KST at UTC+09:00. The IANA identifiers are Asia/Colombo and Asia/Seoul.
Does daylight saving time affect the Colombo–Seoul difference?
Neither zone observes daylight saving time, so the +3h 30m offset between Colombo and Seoul is fixed all year.
Which other cities share Colombo's time zone?
IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.
Which countries use IST, Colombo's zone?
IST is used in India, Sri Lanka.
Is there a day difference between Colombo and Seoul?
Not normally. The +3h 30m gap only pushes the date over for late-evening times.
What is the time difference between Colombo and Seoul?
Seoul is +3h 30m from Colombo.
What timezone is Colombo in?
Colombo operates on Sri Lanka Time (SLST), UTC+5:30. Sharing India's timezone, Colombo is a key South Asian trade and tourism hub.
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 Colombo?
Standard business hours in Colombo are 9:00 AM - 5:00 PM IST.
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 Colombo and Seoul?
The best overlap for a call is when both cities are in business hours. Colombo works 9:00 AM - 5:00 PM IST and Seoul works 9:00 AM - 6:00 PM KST (+3h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Colombo and Seoul?
Colombo uses LKR (Rs) while Seoul uses KRW (₩). Check current exchange rates when planning travel or business between these cities.
How do Colombo and Seoul compare in size?
Colombo has a population of approximately 752,000 (metro: 5.6 million), while Seoul has approximately 9.7 million (metro: 25.5 million).
What are the major landmarks in Colombo and Seoul?
Colombo is known for Galle Face Green, Gangaramaya Temple, Colombo Lotus Tower. Seoul is famous for Gyeongbokgung Palace, N Seoul Tower, Bukchon Hanok Village.
Do Colombo and Seoul have stock exchanges?
Yes. Colombo has the CSE (Colombo Stock Exchange) and Seoul has the KRX (Korea Exchange). The +3h 30m time difference affects trading hour overlaps between these exchanges.
Which countries use IST (India Standard Time)?
IST is used in India, Sri Lanka.
Does IST observe daylight saving time?
No, IST does not observe daylight saving time and remains at UTC+05:30 year-round.
What are some interesting facts about IST?
India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT. India uses a single time zone despite spanning 30° of longitude.
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 Colombo, what time is it in Seoul?
When it is 12:00 AM (midnight) in Colombo (IST), it is +3h 30m later in Seoul (KST).
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