IST to JST Converter – Convert Indian Time to Japan Time

JST is 3 hours 30 minutes ahead of IST, so to convert mentally, add 3 hours 30 minutes to your IST time. For example: 9:00 AM IST = 12:30 PM JST.

JST (Japan Standard Time, UTC+9) is 3 hours 30 minutes ahead of IST (India Standard Time, UTC+5:30) during standard time. For example, 9:00 AM IST = 12:30 PM JST.

The best overlap for standard business hours (9 AM–5 PM) in both zones is 09:00–13:30 IST = 12:30–17:00 JST. 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.

India does not observe Daylight Saving Time. IST remains constant year-round, which simplifies conversions.

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.

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.

JST is 3 hours 30 minutes ahead of IST. The best overlap for business hours is 09:00–13:30 IST = 12:30–17:00 JST. Always include both local times in calendar invites (for example, "2:00 PM IST / 5:30 PM JST JST"). 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.