CST to IST Time Converter
India Standard Time (IST) is currently 11 hours 30 minutes ahead of Central Standard Time (CST). CST is UTC-6 and IST is UTC+5:30. The table below converts every hour of the day between the two, and the call planner shows where working hours line up.
Best Time for a Call
There is no overlap between 9:00 AM and 5:00 PM office hours in these two zones. Stretching to early mornings and evenings, the workable window runs from 7:00 AM to 9:30 AM in CST, which is 6:30 PM to 9:00 PM in IST. One side ends up outside normal hours, so alternating who takes the awkward slot is a fair way to handle recurring calls.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: CST to IST
Rows marked office hours fall between 9:00 AM and 5:00 PM in both places. For a specific date, use the interactive converter.
Does the Difference Change During the Year?
CST and IST are fixed offsets, so the difference between them never changes.
This page covers North American Central Standard Time, UTC-6. The region switches to CDT (UTC-5) in summer. CST can also refer to China Standard Time, which is UTC+8.
This page covers India Standard Time, UTC+5:30, which has no daylight saving. IST can also refer to Irish Standard Time (UTC+1) or Israel Standard Time (UTC+2).
Frequently Asked Questions
How many hours ahead is IST compared to CST?
IST is currently 11 hours 30 minutes ahead of CST. CST and IST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in CST in IST?
9:00 AM in CST is 8:30 PM in IST.
What is the best time for a call between CST and IST?
There is no overlap between 9:00 AM and 5:00 PM office hours in these two zones. Stretching to early mornings and evenings, the workable window runs from 7:00 AM to 9:30 AM in CST, which is 6:30 PM to 9:00 PM in IST. One side ends up outside normal hours, so alternating who takes the awkward slot is a fair way to handle recurring calls.