CST to IST converter
Central Time to India Standard Time. IST is 11 h 30 min ahead of CST in January and 10 h 30 min ahead in July.
From
CST · Chicago CDT · UTC−5
- IST · KolkataUTC+5:30 · 10 h 30 min ahead19:30Mon, Sep 28
The gap between CST and IST
| 2026 | CST clocks | IST clocks | Difference |
|---|---|---|---|
| January | CST UTC−6 | GMT+5:30 UTC+5:30 | 11 h 30 min ahead |
| July | CDT UTC−5 | GMT+5:30 UTC+5:30 | 10 h 30 min ahead |
The gap changes on: Sun, March 8, 2026 (10 h 30 min ahead); Sun, November 1, 2026 (11 h 30 min ahead); Sun, March 14, 2027 (10 h 30 min ahead); Sun, November 7, 2027 (11 h 30 min ahead).
Convert the other way: IST to CST · Plan a meeting across more places
CST to IST time table
Every hour of the CST day and the matching IST time, for a mid-January and a mid-July date.
| CST | IST · January | IST · July |
|---|---|---|
| 12:00 AM | 11:30 AM | 10:30 AM |
| 1:00 AM | 12:30 PM | 11:30 AM |
| 2:00 AM | 1:30 PM | 12:30 PM |
| 3:00 AM | 2:30 PM | 1:30 PM |
| 4:00 AM | 3:30 PM | 2:30 PM |
| 5:00 AM | 4:30 PM | 3:30 PM |
| 6:00 AM | 5:30 PM | 4:30 PM |
| 7:00 AM | 6:30 PM | 5:30 PM |
| 8:00 AM | 7:30 PM | 6:30 PM |
| 9:00 AM | 8:30 PM | 7:30 PM |
| 10:00 AM | 9:30 PM | 8:30 PM |
| 11:00 AM | 10:30 PM | 9:30 PM |
| 12:00 PM | 11:30 PM | 10:30 PM |
| 1:00 PM | 12:30 AM (+1 day) | 11:30 PM |
| 2:00 PM | 1:30 AM (+1 day) | 12:30 AM (+1 day) |
| 3:00 PM | 2:30 AM (+1 day) | 1:30 AM (+1 day) |
| 4:00 PM | 3:30 AM (+1 day) | 2:30 AM (+1 day) |
| 5:00 PM | 4:30 AM (+1 day) | 3:30 AM (+1 day) |
| 6:00 PM | 5:30 AM (+1 day) | 4:30 AM (+1 day) |
| 7:00 PM | 6:30 AM (+1 day) | 5:30 AM (+1 day) |
| 8:00 PM | 7:30 AM (+1 day) | 6:30 AM (+1 day) |
| 9:00 PM | 8:30 AM (+1 day) | 7:30 AM (+1 day) |
| 10:00 PM | 9:30 AM (+1 day) | 8:30 AM (+1 day) |
| 11:00 PM | 10:30 AM (+1 day) | 9:30 AM (+1 day) |
About these two clocks
CST — Central Time. Used in Chicago, Dallas, Houston, Mexico City is separate. CST is the winter name; in summer the same clocks run on CDT (UTC−5). Conversions here follow the clocks.
IST — India Standard Time. Used in all of India — Mumbai, Delhi, Bengaluru. India does not use daylight saving time, so IST is UTC+5:30 all year.
All figures on this page come from the IANA time zone database (the same data your phone and laptop use), evaluated for the date in question. Abbreviations are ambiguous — “IST” also means Irish or Israel Standard Time, and “CST” is China Standard Time in Asia — so this page uses America/Chicago and Asia/Kolkata explicitly.
Questions people ask
How many hours ahead or behind is IST compared with CST?
IST is 11 h 30 min ahead of CST in January and 10 h 30 min ahead in July. The gap moves because daylight saving time starts and ends on different dates (or not at all) in the two places.
What is 9 am CST in IST?
On a January date, 9:00 am CST is 8:30 PM IST. In July it is 7:30 PM. Use the converter above for any other date.
Which cities use CST?
Central Time (CST) is used in Chicago, Dallas, Houston, Mexico City is separate. CST is the winter name; in summer the same clocks run on CDT (UTC−5). Conversions here follow the clocks.
Which cities use IST?
India Standard Time (IST) is used in all of India — Mumbai, Delhi, Bengaluru. India does not use daylight saving time, so IST is UTC+5:30 all year.
When is a good time for a CST–IST call?
Look for the hours where both columns in the table fall between about 8 am and 6 pm. If none exist, the meeting planner on our home page shows the least-bad options and lets you share a link that converts for every attendee.
Related conversions
EST to ISTCST to ESTUTC to ISTPST to ISTCET to ISTGMT to ISTCST to PSTBST to ISTSGT to ISTAEST to IST