Offset
The time difference between Chennai and Chicago is 10.5 hours.
Chennai (IST) is ahead of Chicago (CDT).
IST: UTC+5:30
CDT: UTC-5
Chicago is currently observing daylight saving time; Chennai is not.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Chennai and Chicago don't overlap on the same weekday. Chicago is 10 hours behind Chennai.
With some flexibility, there’s a workable window outside standard hours:
- 6 PM–8 PM in Chennai (7 AM–9 AM in Chicago) — suggest 7:00 PM Chennai (8:30 AM Chicago).
This means an early start or late finish for one side, but it’s a reasonable slot for a one-off meeting.
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
United States
- New Year's DayThu, Jan 1
- Martin Luther King, Jr. DayMon, Jan 19
- Presidents DayMon, Feb 16
- Memorial DayMon, May 25
- Juneteenth National Independence DayFri, Jun 19
- Independence DayFri, Jul 3
- Labour DayMon, Sep 7
- Columbus DayMon, Oct 12
- Veterans DayWed, Nov 11
- Thanksgiving DayThu, Nov 26
- Christmas DayFri, Dec 25
About these zones
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Chennai | Chicago | Day |
|---|---|---|
| 12:00 am | 1:30 pm | -1 day |
| 1:00 am | 2:30 pm | -1 day |
| 2:00 am | 3:30 pm | -1 day |
| 3:00 am | 4:30 pm | -1 day |
| 4:00 am | 5:30 pm | -1 day |
| 5:00 am | 6:30 pm | -1 day |
| 6:00 am | 7:30 pm | -1 day |
| 7:00 am | 8:30 pm | -1 day |
| 8:00 am | 9:30 pm | -1 day |
| 9:00 am | 10:30 pm | -1 day |
| 10:00 am | 11:30 pm | -1 day |
| 11:00 am | 12:30 am | Same day |
| 12:00 pm | 1:30 am | Same day |
| 1:00 pm | 2:30 am | Same day |
| 2:00 pm | 3:30 am | Same day |
| 3:00 pm | 4:30 am | Same day |
| 4:00 pm | 5:30 am | Same day |
| 5:00 pm | 6:30 am | Same day |
| 6:00 pm | 7:30 am | Same day |
| 7:00 pm | 8:30 am | Same day |
| 8:00 pm | 9:30 am | Same day |
| 9:00 pm | 10:30 am | Same day |
| 10:00 pm | 11:30 am | Same day |
| 11:00 pm | 12:30 pm | Same day |
Daylight saving time
Chicago observes daylight saving time; Chennai does not. The offset between the two zones changes when Chicago transitions: on Sunday, November 1, 2026, clocks fall back from CDT to CST.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:43 AM
- Sunset
- 6:35 PM
- Day length
- 12h 52m
- Sunrise
- 5:17 AM
- Sunset
- 8:24 PM
- Day length
- 15h 7m
Daylight overlap: 1h 11m — 5:43 AM–6:54 AM in Chennai (7:13 PM–8:24 PM in Chicago). Both locations are in daylight during this window.
Cities in these zones
Other cities in India Standard Time
Other cities in Central Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in India Standard Time
- BOM
- NMI
- DEL
- BLR
- HYD
- AMD
- MAA
- CCU
- STV
- PNQ
Airports in Central Time
- GYY
- MDW
- ORD
- HOU
- IAH
- SAT
- DAL
- DFW
- AUS
- BNA
Related conversions
Common conversions
- What is 9:00 am Chennai in Chicago?
- 9:00 am Chennai is 10:30 pm Chicago, the previous day.
- What is 12:00 pm Chennai in Chicago?
- 12:00 pm Chennai is 1:30 am Chicago.
- What is 12:30 pm Chennai in Chicago?
- 12:30 pm Chennai is 2:00 am Chicago.
- What is 2:00 pm Chennai in Chicago?
- 2:00 pm Chennai is 3:30 am Chicago.
- What is 5:00 pm Chennai in Chicago?
- 5:00 pm Chennai is 6:30 am Chicago.
- What is 11:30 pm Chennai in Chicago?
- 11:30 pm Chennai is 1:00 pm Chicago.