Kolkata zone
GMT+5:30 (GMT+5:30)
Chicago zone
CDT (GMT-5)
Difference
10h 30m behind Kolkata
Business overlap
No 9-5 overlap
Working hours overlap
Each cell is one hour in Kolkata. Filled cells mark when 9 AM – 5 PM in Kolkata and Chicago both apply.
0 hours per day
- Kolkata
- GMT+5:30
- Chicago
- GMT-5
- Difference
- -10h 30m
- Business overlap
- 0h
Hour-by-hour conversion
Each row shows the matching local time in Chicago for an hour in Kolkata.
| Kolkata | Chicago | Day | Window |
|---|---|---|---|
| 12:00 AM | 1:30 PM | previous day | — |
| 1:00 AM | 2:30 PM | previous day | — |
| 2:00 AM | 3:30 PM | previous day | — |
| 3:00 AM | 4:30 PM | previous day | — |
| 4:00 AM | 5:30 PM | previous day | — |
| 5:00 AM | 6:30 PM | previous day | — |
| 6:00 AM | 7:30 PM | previous day | — |
| 7:00 AM | 8:30 PM | previous day | — |
| 8:00 AM | 9:30 PM | previous day | — |
| 9:00 AM | 10:30 PM | previous day | — |
| 10:00 AM | 11:30 PM | previous 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 | — |
Best meeting windows
Standard 9 AM – 5 PM hours in Kolkata and Chicago do not overlap. Plan calls for early Kolkata morning or late Kolkata evening, and rotate the burden between sides.
Tighter overlap is achievable by having the side with later working hours start earlier, or by treating the first and last hours of each side as flexible. The bar above marks every hour where both cities sit inside a 9 AM – 5 PM window.
About converting Kolkata time to Chicago time
Kolkata follows the Asia/Kolkata time zone (currently GMT+5:30, GMT+5:30), while Chicago follows America/Chicago (currently CDT, GMT-5). Chicago is 10h 30m behind Kolkata right now.
Chicago observes daylight saving time, while Kolkata does not. The offset between the two cities changes by one hour at the daylight saving transitions.
Daylight saving transitions in 2026
Kolkata
Does not observe daylight saving time.
Chicago
- Spring forward · Sunday, March 8, 2026
- Fall back · Sunday, November 1, 2026
Reverse this conversion
Chicago to Kolkata
Open the converter
Plan a meeting between Kolkata and Chicago
More conversions from Kolkata
Frequently asked questions
- How many hours is Kolkata from Chicago?
- Chicago is 10h 30m behind Kolkata right now.
- What time is 9:00 AM Kolkata in Chicago?
- 9:00 AM in Kolkata is 10:30 PM (previous day) in Chicago.
- What time is 5:00 PM Kolkata in Chicago?
- 5:00 PM in Kolkata is 6:30 AM in Chicago.
- When do Kolkata and Chicago business hours overlap?
- Standard 9 AM - 5 PM working hours in Kolkata and Chicago do not overlap. You will need an early or late call.
- Does daylight saving time change the difference between Kolkata and Chicago?
- Chicago observes daylight saving time while Kolkata does not, so the offset between them changes by one hour twice a year.
Local time page
Time in Kolkata
Local time page
Time in Chicago