IST is 10h30 ahead of CST or 9h30 ahead of CDT. India has no DST.
What is the time difference between Central Time and IST?
The time difference between Central Time and Indian Standard Time (IST) depends on whether Daylight Saving Time is in effect. During standard time (CST), IST is 10 hours and 30 minutes ahead. During daylight time (CDT), IST is 9 hours and 30 minutes ahead.