Sri Lanka to Seoul
+3h 30mSri Lanka
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 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 +3h 30m Gap: Sri Lanka vs Seoul
Sri Lanka runs on India Standard Time (IST) at UTC+05:30. Seoul runs on Korean Standard Time (KST) at UTC+09:00. That puts Sri Lanka 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 Sri Lanka it is 12:30 PM in Seoul. Midnight in Sri Lanka is 3:30 AM in Seoul. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sri Lanka to Seoul time conversion table
| Sri Lanka (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 Sri Lanka to Seoul time
- Scheduling a call from Sri Lanka to Seoul: a 10:00 AM start in Sri Lanka lands at 1:30 PM in Seoul, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Sri Lanka 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.
- Watching a live event or market open: Sri Lanka viewers need 12:30 PM in Seoul to catch a 9:00 AM start there, and 8:30 PM if the event is anchored to Sri Lanka.
- 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 Sri Lanka 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 Sri Lanka and Seoul
Both Sri Lanka 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
Sri Lanka and Seoul overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
Sri Lanka 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 Sri Lanka and Seoul?
Sri Lanka (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 Sri Lanka time to Seoul time?
Add +3h 30m to Sri Lanka local time. For example, 9:00 AM in Sri Lanka 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 Sri Lanka.
What is the best time to call Seoul from Sri Lanka?
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, Sri Lanka or Seoul?
Sri Lanka is 3 hours 30 minutes ahead of Seoul. When it is 12:00 PM in Sri Lanka it is 3:30 PM in Seoul.
Do Sri Lanka and Seoul use different time zones?
Sri Lanka (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 Sri Lanka–Seoul difference?
Neither zone observes daylight saving time, so the +3h 30m offset between Sri Lanka and Seoul is fixed all year.
Which other cities share Sri Lanka's time zone?
IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.
Which countries use IST, Sri Lanka's zone?
IST is used in India, Sri Lanka.
Is there a day difference between Sri Lanka and Seoul?
Not normally. The +3h 30m gap only pushes the date over for late-evening times.
What is the time difference between Sri Lanka and Seoul?
Seoul is +3h 30m from Sri Lanka.
What timezone is Sri Lanka in?
Sri Lanka operates on its local timezone.
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 Seoul?
Standard business hours in Seoul are 9:00 AM - 6:00 PM KST.
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 Sri Lanka, what time is it in Seoul?
When it is 12:00 AM (midnight) in Sri Lanka (IST), it is +3h 30m later in Seoul (KST).
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