IST to CST converter
CST is 10.5 hours behind IST right now. India Standard Time is the clock in New Delhi; Central Time is the clock in Chicago.
Why the gap changes
India keeps UTC+5:30 all year; Chicago switches for daylight saving, so the gap changes in March and November. The half-hour offset means a call on the hour in Chicago starts at half past in India.
Over the next 12 months the difference is 10.5 hours or 11.5 hours, depending on the date. The table and the converter always use the date you pick. See EST vs EDT for why the abbreviations change.
IST to CST conversion table
For Saturday, October 31, 2026, hour by hour.
| New Delhi (IST) | Chicago (CST) |
|---|---|
| 12:00 AM | 1:30 PM (prev. day) |
| 1:00 AM | 2:30 PM (prev. day) |
| 2:00 AM | 3:30 PM (prev. day) |
| 3:00 AM | 4:30 PM (prev. day) |
| 4:00 AM | 5:30 PM (prev. day) |
| 5:00 AM | 6:30 PM (prev. day) |
| 6:00 AM | 7:30 PM (prev. day) |
| 7:00 AM | 8:30 PM (prev. day) |
| 8:00 AM | 9:30 PM (prev. day) |
| 9:00 AM | 10:30 PM (prev. day) |
| 10:00 AM | 11:30 PM (prev. day) |
| 11:00 AM | 12:30 AM |
| 12:00 PM | 1:30 AM |
| 1:00 PM | 2:30 AM |
| 2:00 PM | 3:30 AM |
| 3:00 PM | 4:30 AM |
| 4:00 PM | 5:30 AM |
| 5:00 PM | 6:30 AM |
| 6:00 PM | 7:30 AM |
| 7:00 PM | 8:30 AM |
| 8:00 PM | 9:30 AM |
| 9:00 PM | 10:30 AM |
| 10:00 PM | 11:30 AM |
| 11:00 PM | 12:30 PM |
Best overlap for meetings
A 9-to-5 day in New Delhi and in Chicago doesn’t overlap at all today, so one side has to start early or stay late. Try other hours or add more cities in the meeting planner.
Related conversions
Frequently asked questions
What is 9 AM IST in CST?
Today, 9:00 AM in New Delhi (GMT+5:30) is 10:30 PM in Chicago (CDT). The table on this page lists every hour.
How many hours apart are IST and CST?
CST is 10.5 hours behind IST right now. Over a year the gap takes 2 values (10.5 hours, 11.5 hours) because the two zones change clocks for daylight saving on different dates, or only one of them does.
When do IST and CST working hours overlap?
With a 9-to-5 day in both places there is no shared hour today; one side has to start early or stay late. The meeting planner can test other hours.