CST to IST
Converting a fixed time. America/Chicago → Asia/Kolkata
Clocks go back 1 hour on Sunday, 1st November 2026, at 1:59 am local time (1:00 am after the change).
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
| CST | IST | 24h | Good to call? |
|---|---|---|---|
| 12am | 10am | 00:00 → 10:30 | asleep in CST |
| 1am | 11am | 01:00 → 11:30 | asleep in CST |
| 2am | 12pm | 02:00 → 12:30 | asleep in CST |
| 3am | 1pm | 03:00 → 13:30 | asleep in CST |
| 4am | 2pm | 04:00 → 14:30 | asleep in CST |
| 5am | 3pm | 05:00 → 15:30 | asleep in CST |
| 6am | 4pm | 06:00 → 16:30 | asleep in CST |
| 7am | 5pm | 07:00 → 17:30 | awake, not at work |
| 8am | 6pm | 08:00 → 18:30 | awake, not at work |
| 9am | 7pm | 09:00 → 19:30 | awake, not at work |
| 10am | 8pm | 10:00 → 20:30 | awake, not at work |
| 11am | 9pm | 11:00 → 21:30 | awake, not at work |
| 12pm now | 10pm | 12:00 → 22:30 | asleep in IST |
| 1pm | 11pm | 13:00 → 23:30 | asleep in IST |
| 2pm | 12am Fri | 14:00 → 00:30 | asleep in IST |
| 3pm | 1am Fri | 15:00 → 01:30 | asleep in IST |
| 4pm | 2am Fri | 16:00 → 02:30 | asleep in IST |
| 5pm | 3am Fri | 17:00 → 03:30 | asleep in IST |
| 6pm | 4am Fri | 18:00 → 04:30 | asleep in IST |
| 7pm | 5am Fri | 19:00 → 05:30 | asleep in IST |
| 8pm | 6am Fri | 20:00 → 06:30 | asleep in IST |
| 9pm | 7am Fri | 21:00 → 07:30 | awake, not at work |
| 10pm | 8am Fri | 22:00 → 08:30 | asleep in CST |
| 11pm | 9am Fri | 23:00 → 09:30 | asleep in CST |
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.
10am
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Questions people ask
What time is it in IST when it is 9:00 am in CST?
7:30 pm in IST the same day.
How many hours ahead is IST of CST?
IST is 10 hours 30 minutes ahead CST. 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 CST and IST?
There is no hour when both places are inside normal working hours. The least bad slot is usually early morning at the western end.
When does the difference between CST and IST change?
CST: Clocks go back 1 hour on Sunday, 1st November 2026, at 1:59 am local time (1:00 am after the change). IST does not change its clocks, so the gap shifts by an hour on that date.