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BlogHow it works

JST to IST Converter

Choose a Tokyo time to read the clock in Delhi, Mumbai or Bengaluru. Neither country changes its clocks, so the result holds for every date.

Japan Standard Time

JSTJapan Standard Time

ISTIndia Standard Time

––:––

3:30

Hours and minutes that Tokyo is ahead of India, on every date

Japan is on UTC+9 and India on UTC+5:30, and neither one moves its clocks. Subtract 3 h 30 min from a Tokyo time to get India time.

Tokyo to India hour table

JST timeIST time
12:00 AM8:30 PM−1 previous day
1:00 AM9:30 PM−1 previous day
2:00 AM10:30 PM−1 previous day
3:00 AM11:30 PM−1 previous day
4:00 AM12:30 AM
5:00 AM1:30 AM
6:00 AM2:30 AM
7:00 AM3:30 AM
8:00 AM4:30 AM
9:00 AM5:30 AM
10:00 AM6:30 AM
11:00 AM7:30 AM
12:00 PM8:30 AM
1:00 PM9:30 AM
2:00 PM10:30 AM
3:00 PM11:30 AM
4:00 PM12:30 PM
5:00 PM1:30 PM
6:00 PM2:30 PM
7:00 PM3:30 PM
8:00 PM4:30 PM
9:00 PM5:30 PM
10:00 PM6:30 PM
11:00 PM7:30 PM
Every Tokyo hour with the matching India time. Before 3:30 AM in Tokyo, India is still on the previous day.

Two fixed offsets

Japan Standard Time follows the 135° east meridian and has had no daylight saving for decades; NICT keeps the national time scale. India Standard Time is based on the 82.5° east meridian, which is why it ends in a half hour. The difference of 52.5 degrees works out to 3 hours 30 minutes.

Both offsets are listed in the IANA time zone database, so phones and calendars convert this pair the same way on any date.

Shared hours for Japan–India teams

The overlap is generous by Asian standards. The India working day starts at 12:30 PM in Tokyo, just after the Japanese lunch hour, and the Tokyo day ends at 6:00 PM, which is 2:30 PM in India. That leaves about five and a half hours of common office time.

Morning stand-ups in India land in the Japanese early afternoon, and a late-afternoon India deadline arrives after Tokyo has gone home. Plan handoffs so that Japan reviews work at the start of its own morning.

Do

  • Put shared calls at 1:00–3:00 PM in Tokyo (9:30–11:30 AM in India).
  • Name both clocks in the invite: 2:00 PM JST / 10:30 AM IST.

Avoid

  • Rounding the gap to 3 or 4 hours; the half hour matters.
  • Scheduling for 9:00 AM Tokyo time, which is 5:30 AM in India.

For Korea the numbers are identical, see KST to IST. The Delhi clock shows India's current time, and IST to SGT covers Singapore.

JST to IST questions

How many hours is Japan ahead of India?

Japan is 3 hours 30 minutes ahead of India throughout the year.

What time is it in India at 10:00 AM in Tokyo?

It is 6:30 AM in India on the same day.

Does the Japan–India gap change in summer?

No. Japan stays on UTC+9 and India on UTC+5:30, and neither uses daylight saving.

When can Tokyo and Bengaluru teams meet in office hours?

Between 12:30 PM and 6:00 PM Tokyo time, which is 9:00 AM to 2:30 PM in India.

Is the gap from Seoul to India the same?

Yes. Korea Standard Time is also UTC+9, so Seoul is 3 h 30 min ahead of India as well.