JST to IST Converter – Convert Japan Time to Indian Time
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Complete JST ↔ IST Conversion Table
All 24 hours · Both DST seasons · Best meeting windows marked ★
| JST Time | IST Time UTC+9 → UTC+5:30 (−3h 30m, constant) |
|---|---|
| 12:00 AM (midnight) | prev 8:30 PM |
| 1:00 AM | prev 9:30 PM |
| 2:00 AM | prev 10:30 PM |
| 3:00 AM | prev 11:30 PM |
| 4:00 AM | 12:30 AM |
| 5:00 AM | 1:30 AM |
| 6:00 AM | 2:30 AM |
| 7:00 AM | 3:30 AM |
| 8:00 AM | 4:30 AM |
| 9:00 AM | 5:30 AM |
| 10:00 AM | 6:30 AM |
| 11:00 AM | 7:30 AM |
| 12:00 PM (noon) | 8:30 AM |
| ★ 1:00 PM | ★ 9:30 AM |
| ★ 2:00 PM | ★ 10:30 AM |
| ★ 3:00 PM | ★ 11:30 AM |
| ★ 4:00 PM | ★ 12:30 PM |
| 5:00 PM | 1:30 PM |
| 6:00 PM | 2:30 PM |
| 7:00 PM | 3:30 PM |
| 8:00 PM | 4:30 PM |
| 9:00 PM | 5:30 PM |
| 10:00 PM | 6:30 PM |
| 11:00 PM | 7:30 PM |
What is the time difference between JST and IST?
IST is 3 hours 30 minutes behind JST. Neither JST nor IST observes Daylight Saving Time, so this gap never changes. 9:00 AM JST = 5:30 AM IST. 12:00 PM JST = 8:30 AM IST. 5:00 PM JST = 1:30 PM IST.
What is the best time to call from Tokyo to Mumbai?
The business hours overlap between JST and IST runs from 12:30 PM to 5:00 PM JST (9:00 AM to 1:30 PM IST). Scheduling calls in this window keeps both sides within normal working hours.
Frequently Asked Questions about JST and IST
IST is 3 hours 30 minutes behind JST, so to convert mentally, subtract 3 hours 30 minutes to your JST time. For example: 9:00 AM JST = 5:30 AM IST.
IST (India Standard Time, UTC+5:30) is 3 hours 30 minutes behind JST (Japan Standard Time, UTC+9) during standard time. For example, 9:00 AM JST = 5:30 AM IST.
The best overlap for standard business hours (9 AM–5 PM) in both zones is 12:30–17:00 JST = 09:00–13:30 IST. Schedule recurring calls in this window to keep both sides within normal working hours. Remember to re-check the window in March and November (or March/October for European zones) when DST transitions can shift the overlap by 1 hour.
Japan does not observe Daylight Saving Time. JST remains constant year-round, which simplifies conversions.
Major cities in the JST (Japan Standard Time, UTC+9) timezone include: Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Fukuoka. JST is a fixed-offset zone - these cities do not observe Daylight Saving Time.
Major cities in the IST (India Standard Time, UTC+5:30) timezone include: Mumbai, New Delhi, Bangalore, Chennai, Kolkata, Hyderabad, Pune. IST is a fixed-offset zone - these cities do not observe Daylight Saving Time.
IST is 3 hours 30 minutes behind JST. The best overlap for business hours is 12:30–17:00 JST = 09:00–13:30 IST. Always include both local times in calendar invites (for example, "2:00 PM JST / 10:30 AM IST IST"). Double-check around March and November (or March/October for European zones) when DST transitions can shift the offset by 1 hour. For full scheduling guidance, see our international meeting times guide.
Need more help? Check our complete FAQ section.
View Complete FAQPopular Cities in These Timezones
IST Timezone Cities:
Mumbai, Delhi, Bangalore, Kolkata
PST Timezone Cities:
Los Angeles, San Francisco, Seattle, Portland