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CST to IST Time

Convert CST to IST instantly with ConvertCalculate, providing accurate time conversion, accounting for daylight saving, and supporting both 12-hour and 24-hour formats for easy global planning.

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  • Runs in your browser
In short

IST (UTC+5:30) is 11 hours and 30 minutes ahead of CST (UTC−6) in standard time. 10:20 PM CST is 9:50 AM the next day IST. During daylight saving time (roughly March to early November) the gap is 10 hours and 30 minutes, so 10:20 PM CDT is 8:50 AM the next day IST.

About CST to IST Time

CST covers Chicago, Dallas, Houston, Mexico City and Winnipeg. IST covers Delhi, Mumbai, Bengaluru, Hyderabad, Chennai and Kolkata.

Normal working days barely overlap: when one side starts, the other has finished. Calls usually mean early morning for one and evening for the other — the timeline above shows exactly how early.

The clocks do not change on the same day, so a recurring meeting can shift by an hour in March and again in November. Check any standing call in the two weeks after each change.

How it works

India Standard Time is 11.5 hours ahead of Central Time (Chicago) between November and March, and 10.5 hours ahead the rest of the year.

  1. Take the CST time you want to convert.
  2. Add 11.5 hours between autumn and spring, or 10.5 hours during daylight saving.
  3. Roll the date forward or back if the result crosses midnight.

The gap changes because the two places start and end daylight saving on different dates — for a few weeks each spring and autumn the difference is an hour off its usual value. The converter above uses the live IANA time zone database, so it is right on those days too.

Zone details: CST is −6 in winter and −5 in summer (UTC), IST is +5:30 all year.

Examples

A working day in CST, seen from IST (during daylight saving):

CST to IST at a glance
CSTIST
09:00 CST19:30 IST
12:00 CST22:30 IST
15:00 CST01:30 IST (next day)
18:00 CST04:30 IST (next day)
21:00 CST07:30 IST (next day)

Meetings usually work best where the two working days overlap. Drag the timeline above to see the overlap for any hour, or use the full time zone converter for any other pair of cities.

CST to IST Time: frequently asked questions

What is the time difference between CST and IST?
IST is 11 hours and 30 minutes ahead of CST in standard time (CST is UTC−6, IST is UTC+5:30). The gap can change by an hour for part of the year because CST observes daylight saving (CDT) and IST does not observe daylight saving.
What is 9 AM CST in IST?
9:00 AM CST is 8:30 PM IST (standard time).
Where is CST used?
Central Standard Time (UTC−6) is used in the US Central (Chicago, Dallas).
Where is IST used?
India Standard Time (UTC+5:30) is used in India (no daylight saving).