IST to KST Converter
Convert time between India Standard Time (IST) and Korea Standard Time (KST)
India Standard Time (IST)
Korea Standard Time (KST)
Time Difference
Korea Standard Time (KST) is 0 hours ahead of India Standard Time (IST)
Select Date
Select Time
Quick Reference
| IST | KST |
|---|---|
| 07:30 | 11:00 |
| 09:30 | 13:00 |
| 11:30 | 15:00 |
| 13:30 | 17:00 |
| 15:30 | 19:00 |
| 17:30 | 21:00 |
| 19:30 | 23:00 |
| 21:30 | 01:00 |
| 23:30 | 03:00 |
| 01:30 | 05:00 |
| 03:30 | 07:00 |
| 05:30 | 09:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
About IST to KST Time Conversion
Converting time from India Standard Time (IST) to Korea Standard Time (KST) is essential for India-South Korea coordination. IST is UTC+5:30 and KST is UTC+9, making KST 3.5 hours ahead of IST. Neither India nor South Korea observe daylight saving time, so the 3.5-hour offset holds year-round.
This moderate gap supports good business-hour overlap — Indian afternoons align with the latter half of a Korean workday. Whether you are coordinating with Seoul, Busan, or Incheon teams on tech, manufacturing, or trade projects, our IANA-based converter gives reliable results in every season.
Common Use Cases for IST to KST Conversion
Business & Work
- Scheduling calls between Indian teams and Seoul or Busan offices
- Coordinating tech, semiconductor, or manufacturing projects between India and South Korea
- Planning daily standups that fit both Indian and Korean working hours
Personal & Travel
- Keeping in touch with family or friends living in South Korea
- Planning travel from India to Seoul, Busan, or Jeju
- Scheduling online study, K-content watch parties, or virtual events across both regions
Time Zone Information
India Standard Time (IST)
- UTC Offset: UTC+5:30
- IANA Timezone: Asia/Kolkata
- Daylight Saving: No daylight saving time (consistent year-round)
- Major Cities: New Delhi, Mumbai, Bangalore, Hyderabad, Chennai, Kolkata
- Coverage: Entire India (single timezone covering the nation)
Korea Standard Time (KST)
- UTC Offset: UTC+9 (no DST observed)
- IANA Timezone: Asia/Seoul
- Daylight Saving: South Korea does not observe daylight saving time
- Major Cities: Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju, Jeju
- Coverage: All of South Korea
Quick Reference: IST to KST
Remember: KST is always 3.5 hours ahead of IST. Neither region observes daylight saving time, so this offset is constant.
Frequently Asked Questions
What is the time difference between IST and KST?
India Standard Time (IST) is UTC+5:30, while Korea Standard Time (KST) is UTC+9. KST is 3.5 hours ahead of IST, so when it is 9:00 AM in Delhi, it is 12:30 PM in Seoul.
Does the IST to KST time difference change throughout the year?
No. Neither India nor South Korea observes daylight saving time. IST stays at UTC+5:30 and KST stays at UTC+9 every day of the year, so the 3.5-hour gap is constant.
How do half-hour offsets affect this conversion?
IST sits on a half-hour offset (UTC+5:30) while KST does not, so conversions land on :30 minutes (e.g. 9:00 AM IST → 12:30 PM KST).
What are the best times to schedule IST to KST business calls?
Overlap is good. 9 AM–2 PM IST is 12:30–5:30 PM KST — strong for live calls covering most of the Korean afternoon and the start of the Indian workday. Earlier IST (7–9 AM) catches late-morning Korea if you need more Korean working time.
Which regions and cities use KST?
KST (UTC+9) is used by all of South Korea. Major cities include Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju, and Jeju.
Which regions use IST?
IST (UTC+5:30) covers all of India under a single timezone. Major cities include New Delhi, Mumbai, Bangalore, Hyderabad, Chennai, and Kolkata. India does not observe daylight saving time.
Pro Tips
- • KST is always 3.5 hours ahead of IST — add 3:30 to Indian time.
- • Neither region observes DST, so this conversion is constant year-round.
- • Morning India (9–11 AM IST) is early afternoon in Korea (12:30–2:30 PM KST) — a strong window for live calls.
- • Late-afternoon India (3–5 PM IST) is late evening in Korea (6:30–8:30 PM KST), so push major calls earlier in the Indian day.
- • Korean public holidays — especially Chuseok and Lunar New Year — can shift business activity by several days. Plan around them.
- • KST shares its UTC+9 offset with JST, so a Seoul-Mumbai call can also include Tokyo or Osaka partners.