IST to CST
Converting a fixed time. Asia/Kolkata → America/Chicago
Clocks here do not change — this zone stays on the same offset all year.
Clocks go back 1 hour on Sunday, 1st November 2026, at 1:59 am local time (1:00 am after the change).
Convert a specific time minutes work, not just whole hours
Hour by hour
| IST | CST | 24h | Good to call? |
|---|---|---|---|
| 12am | 1pm Thu | 00:00 → 13:30 | asleep in IST |
| 1am | 2pm Thu | 01:00 → 14:30 | asleep in IST |
| 2am now | 3pm Thu | 02:00 → 15:30 | asleep in IST |
| 3am | 4pm Thu | 03:00 → 16:30 | asleep in IST |
| 4am | 5pm Thu | 04:00 → 17:30 | asleep in IST |
| 5am | 6pm Thu | 05:00 → 18:30 | asleep in IST |
| 6am | 7pm Thu | 06:00 → 19:30 | asleep in IST |
| 7am | 8pm Thu | 07:00 → 20:30 | awake, not at work |
| 8am | 9pm Thu | 08:00 → 21:30 | awake, not at work |
| 9am | 10pm Thu | 09:00 → 22:30 | asleep in CST |
| 10am | 11pm Thu | 10:00 → 23:30 | asleep in CST |
| 11am | 12am | 11:00 → 00:30 | asleep in CST |
| 12pm | 1am | 12:00 → 01:30 | asleep in CST |
| 1pm | 2am | 13:00 → 02:30 | asleep in CST |
| 2pm | 3am | 14:00 → 03:30 | asleep in CST |
| 3pm | 4am | 15:00 → 04:30 | asleep in CST |
| 4pm | 5am | 16:00 → 05:30 | asleep in CST |
| 5pm | 6am | 17:00 → 06:30 | asleep in CST |
| 6pm | 7am | 18:00 → 07:30 | awake, not at work |
| 7pm | 8am | 19:00 → 08:30 | awake, not at work |
| 8pm | 9am | 20:00 → 09:30 | awake, not at work |
| 9pm | 10am | 21:00 → 10:30 | awake, not at work |
| 10pm | 11am | 22:00 → 11:30 | asleep in IST |
| 11pm | 12pm | 23:00 → 12:30 | asleep in IST |
Call times
There is no hour when both places are inside normal working hours. The least bad slot is usually early morning at the western end.
1pm
2pm
3pm
4pm
5pm
6pm
7pm
8pm
9pm
10pm
11pm
12am
1am
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7am
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12pm
Questions people ask
What time is it in CST when it is 5:00 pm in IST?
6:30 am in CST the same day.
How many hours ahead is CST of IST?
CST is 10 hours 30 minutes behind IST. That gap is not fixed: it changes when either place starts or ends daylight saving. 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 IST and CST?
There is no hour when both places are inside normal working hours. The least bad slot is usually early morning at the western end.