JST to IST
Converting a fixed time. Asia/Tokyo → Asia/Kolkata
9:00 am in JST is
5:30 am in IST.
09:00 → 05:30 on a 24-hour clock ·
JST → IST
JST now
6:02am
JST · UTC+9
Asia/Tokyo
Clocks here do not change — this zone stays on the same offset all year.
IST now
2:32am
IST · UTC+5:30
Asia/Kolkata
Clocks here do not change — this zone stays on the same offset all year.
Convert a specific time minutes work, not just whole hours
Hour by hour
| JST | IST | 24h | Good to call? |
|---|---|---|---|
| 12am | 8pm Thu | 00:00 → 20:30 | asleep in JST |
| 1am | 9pm Thu | 01:00 → 21:30 | asleep in JST |
| 2am | 10pm Thu | 02:00 → 22:30 | asleep in IST |
| 3am | 11pm Thu | 03:00 → 23:30 | asleep in IST |
| 4am | 12am | 04:00 → 00:30 | asleep in IST |
| 5am | 1am | 05:00 → 01:30 | asleep in IST |
| 6am now | 2am | 06:00 → 02:30 | asleep in IST |
| 7am | 3am | 07:00 → 03:30 | asleep in IST |
| 8am | 4am | 08:00 → 04:30 | asleep in IST |
| 9am | 5am | 09:00 → 05:30 | asleep in IST |
| 10am | 6am | 10:00 → 06:30 | asleep in IST |
| 11am | 7am | 11:00 → 07:30 | awake, not at work |
| 12pm | 8am | 12:00 → 08:30 | awake, not at work |
| 1pm | 9am | 13:00 → 09:30 | both at work |
| 2pm | 10am | 14:00 → 10:30 | both at work |
| 3pm | 11am | 15:00 → 11:30 | both at work |
| 4pm | 12pm | 16:00 → 12:30 | both at work |
| 5pm | 1pm | 17:00 → 13:30 | awake, not at work |
| 6pm | 2pm | 18:00 → 14:30 | awake, not at work |
| 7pm | 3pm | 19:00 → 15:30 | awake, not at work |
| 8pm | 4pm | 20:00 → 16:30 | awake, not at work |
| 9pm | 5pm | 21:00 → 17:30 | awake, not at work |
| 10pm | 6pm | 22:00 → 18:30 | asleep in JST |
| 11pm | 7pm | 23:00 → 19:30 | asleep in JST |
Call times
Both places are at work between 1pm and 17:00 in Tokyo — 9am to 12pm at the other end.
12am
8pm
8pm
1am
9pm
9pm
2am
10pm
10pm
3am
11pm
11pm
4am
12am
12am
5am
1am
1am
6am
2am
2am
7am
3am
3am
8am
4am
4am
9am
5am
5am
10am
6am
6am
11am
7am
7am
12pm
8am
8am
1pm
9am
9am
2pm
10am
10am
3pm
11am
11am
4pm
12pm
12pm
5pm
1pm
1pm
6pm
2pm
2pm
7pm
3pm
3pm
8pm
4pm
4pm
9pm
5pm
5pm
10pm
6pm
6pm
11pm
7pm
7pm
both at work
work hours here
awake
asleep
Questions people ask
What time is it in IST when it is 9:00 am in JST?
5:30 am in IST the same day.
How many hours ahead is IST of JST?
IST is 3 hours 30 minutes behind JST. Neither place changes its clocks, so that gap is the same all year. The table on this page is recalculated for today, so it is already correct for the current season.
What is the best time to call between JST and IST?
Both places are at work between 1pm and 17:00 in Tokyo — 9am to 12pm at the other end.