IST to KST Converter & Meeting Planner
Quick answer: 9:00 AM IST = 12:30 PM KST (fixed +05:30 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Indian Standard Time (IST) and Korea Standard Time (KST)? You need to account for the standard time difference. Korea Standard Time is normally 3.5 hours ahead of Indian Standard Time. Whether you are coordinating between teams in Mumbai and New Delhi and Seoul and Busan, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM IST = 3:30 AM KST. The full 24-hour IST to KST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM IST = 6:30 PM KST.
| IST Time | KST Time |
|---|---|
| 12:00 AM (00:00) | 3:30 AM (03:30) |
| 1:00 AM (01:00) | 4:30 AM (04:30) |
| 2:00 AM (02:00) | 5:30 AM (05:30) |
| 3:00 AM (03:00) | 6:30 AM (06:30) |
| 4:00 AM (04:00) | 7:30 AM (07:30) |
| 5:00 AM (05:00) | 8:30 AM (08:30) |
| 6:00 AM (06:00) | 9:30 AM (09:30) |
| 7:00 AM (07:00) | 10:30 AM (10:30) |
| 8:00 AM (08:00) | 11:30 AM (11:30) |
| 9:00 AM (09:00) | 12:30 PM (12:30) |
| 10:00 AM (10:00) | 1:30 PM (13:30) |
| 11:00 AM (11:00) | 2:30 PM (14:30) |
| 12:00 PM (12:00) | 3:30 PM (15:30) |
| 1:00 PM (13:00) | 4:30 PM (16:30) |
| 2:00 PM (14:00) | 5:30 PM (17:30) |
| 3:00 PM (15:00) | 6:30 PM (18:30) |
| 4:00 PM (16:00) | 7:30 PM (19:30) |
| 5:00 PM (17:00) | 8:30 PM (20:30) |
| 6:00 PM (18:00) | 9:30 PM (21:30) |
| 7:00 PM (19:00) | 10:30 PM (22:30) |
| 8:00 PM (20:00) | 11:30 PM (23:30) |
| 9:00 PM (21:00) | 12:30 AM (00:30)+1 day |
| 10:00 PM (22:00) | 1:30 AM (01:30)+1 day |
| 11:00 PM (23:00) | 2:30 AM (02:30)+1 day |
Best time to call Seoul from Mumbai
For most work calls, compare the normal business day in Mumbai (IST) with the business day in Seoul (KST). IST commonly covers South Asia, while KST is mainly associated with East Asia.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 9:30 AM - 2:30 PM IST, which corresponds to 1:00 PM - 6:00 PM KST. This window sits inside the typical IST workday (9:30 AM - 6:30 PM) and the KST workday (9:00 AM - 6:00 PM).
- DST Safety: Neither IST nor KST uses Daylight Saving Time in our dataset, making business-hour relationships stable year-round.
- Bombay Stock Exchange (BSE): 09:15-15:30 local time in Mumbai.
- Korea Exchange (KRX): 09:00-15:30 local time in Seoul.
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Frequently Asked Questions
What is the time difference between IST and KST?
During standard time, Korea Standard Time is 3.5 hours ahead of Indian Standard Time.
Does India observe Daylight Saving Time (DST)?
India does not observe Daylight Saving Time and has not done so since 1945. IST remains fixed at UTC+5:30 every day of the year, meaning the offset between India and any DST-observing country shifts by one hour twice annually when those countries change their clocks.
Why does IST have a 30-minute offset?
India chose the 82.5° East meridian — which passes through Mirzapur in Uttar Pradesh — as its central reference longitude, as it bisects the subcontinent geographically. That meridian sits exactly 5 hours and 30 minutes ahead of the Prime Meridian in Greenwich, producing the UTC+5:30 offset that has defined IST since 1906.
Does South Korea observe Daylight Saving Time?
South Korea does not observe Daylight Saving Time and has not done so since 1988, when DST was discontinued following the Seoul Summer Olympics. KST remains fixed at UTC+9:00 every day of the year, meaning the offset between Seoul and any DST-observing country shifts by one hour twice annually when those countries change their clocks.
Are KST and JST the same?
Yes, Korea Standard Time (KST) and Japan Standard Time (JST) share the identical UTC+9:00 offset, and neither country observes Daylight Saving Time. Seoul and Tokyo run on exactly the same clock year-round, which directly supports the deep semiconductor, automotive, and consumer electronics supply chain integration between the two economies.