KST to Colombo
-3h 30mKST
KSTSOURCEColombo
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.
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.
Everything You Need to Know About KST and Colombo Time
KST runs on Korea Standard Time (KST) at UTC+09:00. Colombo runs on India Standard Time (IST) at UTC+05:30. That puts KST 3 hours 30 minutes behind Colombo — a difference of -3h 30m at the current offsets.
In practice, when it is 9:00 AM in KST it is 5:30 AM in Colombo. Midnight in KST is 8:30 PM in Colombo. Neither zone observes daylight saving time, so the offset between them stays constant all year.
KST to Colombo time conversion table
| KST (KST) | Colombo (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 KST to Colombo time
- Scheduling a call from KST to Colombo: a 10:00 AM start in KST lands at 6:30 AM in Colombo, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both KST and Colombo 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.
- Coordinating a KST-based team with Colombo contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- 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 KST and need Colombo 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 KST and Colombo
Both KST and Colombo 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
KST and Colombo overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
KST is 3 hours 30 minutes behind Colombo (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 KST and Colombo?
KST (KST, UTC+09:00) is 3 hours 30 minutes behind Colombo (IST, UTC+05:30). The gap is currently -3h 30m.
How do I convert KST time to Colombo time?
Add -3h 30m to KST local time. For example, 9:00 AM in KST is 5:30 AM in Colombo.
What time is it in Colombo right now?
Colombo 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 KST.
What is the best time to call Colombo from KST?
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, KST or Colombo?
KST is 3 hours 30 minutes behind Colombo. When it is 12:00 PM in KST it is 8:30 AM in Colombo.
Do KST and Colombo use different time zones?
KST uses KST at UTC+09:00, while Colombo (Sri Lanka) uses IST at UTC+05:30. The IANA identifiers are Asia/Seoul and Asia/Colombo.
Does daylight saving time affect the KST–Colombo difference?
Neither zone observes daylight saving time, so the -3h 30m offset between KST and Colombo is fixed all year.
Which other cities share KST's time zone?
KST also covers Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
Which countries use KST, KST's zone?
KST is used in South Korea, North Korea.
Is there a day difference between KST and Colombo?
Not normally. The -3h 30m gap only pushes the date over the previous day.
What is the time difference between KST and Colombo?
Colombo is -3h 30m from KST.
What timezone is KST in?
KST operates on its local timezone.
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 are the business hours in Colombo?
Standard business hours in Colombo are 9:00 AM - 5:00 PM IST.
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 KST, what time is it in Colombo?
When it is 12:00 AM (midnight) in KST (KST), it is -3h 30m later in Colombo (IST).
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