South Korea to Sri Lanka
-3h 30mSouth Korea
KSTSOURCESri Lanka
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 (India Standard 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).
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.
South Korea vs Sri Lanka: Offsets, DST and Best Call Times
South Korea runs on Korean Standard Time (KST) at UTC+09:00. Sri Lanka runs on India Standard Time (IST) at UTC+05:30. That puts South Korea 3 hours 30 minutes behind Sri Lanka — a difference of -3h 30m at the current offsets.
In practice, when it is 9:00 AM in South Korea it is 5:30 AM in Sri Lanka. Midnight in South Korea is 8:30 PM in Sri Lanka. Neither zone observes daylight saving time, so the offset between them stays constant all year.
South Korea to Sri Lanka time conversion table
| South Korea (KST) | Sri Lanka (IST) | Day |
|---|---|---|
| 12:00 AM | 8:30 PM | previous day |
| 6:00 AM | 2:30 AM | same day |
| 7:00 AM | 3:30 AM | same day |
| 8:00 AM | 4:30 AM | same day |
| 9:00 AM | 5:30 AM | same day |
| 12:00 PM | 8:30 AM | same day |
| 3:00 PM | 11:30 AM | same day |
| 5:00 PM | 1:30 PM | same day |
| 6:00 PM | 2:30 PM | same day |
| 9:00 PM | 5:30 PM | same day |
Why people convert South Korea to Sri Lanka time
- Scheduling a call from South Korea to Sri Lanka: a 10:00 AM start in South Korea lands at 6:30 AM in Sri Lanka, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both South Korea and Sri Lanka are inside the 9-to-5 working day between 12:30 PM and 5:00 PM KST time (9:00 AM–1:30 PM IST). That is roughly 4 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in South Korea is 4:30 PM in Sri Lanka makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a -3h 30m gap is not.
- Block 12:30 PM–5:00 PM KST as the recurring meeting window if you work primarily from South Korea and need Sri Lanka colleagues present.
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 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.
Best time to call between South Korea and Sri Lanka
Both South Korea and Sri Lanka sit inside the 9 AM – 5 PM working day between 12:30 PM–5:00 PM KST, which is 9:00 AM–1:30 PM IST. That gives roughly 4 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
South Korea and Sri Lanka overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
South Korea is 3 hours 30 minutes behind Sri Lanka (KST UTC+09:00 → IST UTC+05:30). The shared working window is 12:30 PM–5:00 PM KST. 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 South Korea and Sri Lanka?
South Korea (KST, UTC+09:00) is 3 hours 30 minutes behind Sri Lanka (IST, UTC+05:30). The gap is currently -3h 30m.
How do I convert South Korea time to Sri Lanka time?
Add -3h 30m to South Korea local time. For example, 9:00 AM in South Korea is 5:30 AM in Sri Lanka.
What time is it in Sri Lanka right now?
Sri Lanka uses IST at UTC+05:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -3h 30m offset from South Korea.
What is the best time to call Sri Lanka from South Korea?
Call between 12:30 PM and 5:00 PM KST — that maps to 9:00 AM–1:30 PM IST and keeps both parties inside the working day.
Which is behind, South Korea or Sri Lanka?
South Korea is 3 hours 30 minutes behind Sri Lanka. When it is 12:00 PM in South Korea it is 8:30 AM in Sri Lanka.
Do South Korea and Sri Lanka use different time zones?
South Korea (South Korea) uses KST at UTC+09:00, while Sri Lanka (Sri Lanka) uses IST at UTC+05:30. The IANA identifiers are Asia/Seoul and Asia/Colombo.
Does daylight saving time affect the South Korea–Sri Lanka difference?
Neither zone observes daylight saving time, so the -3h 30m offset between South Korea and Sri Lanka is fixed all year.
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 Sri Lanka?
Not normally. The -3h 30m gap only pushes the date over the previous day.
What is the time difference between South Korea and Sri Lanka?
Sri Lanka is -3h 30m from South Korea.
What timezone is South Korea in?
South Korea operates on its local timezone.
What timezone is Sri Lanka in?
Sri Lanka 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 IST timezone?
Major cities in the IST timezone include Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad.
What is the UTC offset for IST?
India Standard Time (IST) is at UTC+05:30.
What should I know about the IST timezone?
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.
When is it midnight in South Korea, what time is it in Sri Lanka?
When it is 12:00 AM (midnight) in South Korea (KST), it is -3h 30m later in Sri Lanka (IST).
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