Chicago zone
CDT (GMT-5)
Kolkata zone
GMT+5:30 (GMT+5:30)
Difference
10h 30m ahead of Chicago
Business overlap
No 9-5 overlap
Working hours overlap
Each cell is one hour in Chicago. Filled cells mark when 9 AM – 5 PM in Chicago and Kolkata both apply.
0 hours per day
- Chicago
- GMT-5
- Kolkata
- GMT+5:30
- Difference
- +10h 30m
- Business overlap
- 0h
Hour-by-hour conversion
Each row shows the matching local time in Kolkata for an hour in Chicago.
| Chicago | Kolkata | Day | Window |
|---|---|---|---|
| 12:00 AM | 10:30 AM | same day | — |
| 1:00 AM | 11:30 AM | same day | — |
| 2:00 AM | 12:30 PM | same day | — |
| 3:00 AM | 1:30 PM | same day | — |
| 4:00 AM | 2:30 PM | same day | — |
| 5:00 AM | 3:30 PM | same day | — |
| 6:00 AM | 4:30 PM | same day | — |
| 7:00 AM | 5:30 PM | same day | — |
| 8:00 AM | 6:30 PM | same day | — |
| 9:00 AM | 7:30 PM | same day | — |
| 10:00 AM | 8:30 PM | same day | — |
| 11:00 AM | 9:30 PM | same day | — |
| 12:00 PM | 10:30 PM | same day | — |
| 1:00 PM | 11:30 PM | same day | — |
| 2:00 PM | 12:30 AM | next day | — |
| 3:00 PM | 1:30 AM | next day | — |
| 4:00 PM | 2:30 AM | next day | — |
| 5:00 PM | 3:30 AM | next day | — |
| 6:00 PM | 4:30 AM | next day | — |
| 7:00 PM | 5:30 AM | next day | — |
| 8:00 PM | 6:30 AM | next day | — |
| 9:00 PM | 7:30 AM | next day | — |
| 10:00 PM | 8:30 AM | next day | — |
| 11:00 PM | 9:30 AM | next day | — |
Best meeting windows
Standard 9 AM – 5 PM hours in Chicago and Kolkata do not overlap. Plan calls for early Chicago morning or late Chicago 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 Chicago time to Kolkata time
Chicago follows the America/Chicago time zone (currently CDT, GMT-5), while Kolkata follows Asia/Kolkata (currently GMT+5:30, GMT+5:30). Kolkata is 10h 30m ahead of Chicago 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
Chicago
- Spring forward · Sunday, March 8, 2026
- Fall back · Sunday, November 1, 2026
Kolkata
Does not observe daylight saving time.
Reverse this conversion
Kolkata to Chicago
Open the converter
Plan a meeting between Chicago and Kolkata
More conversions from Chicago
Frequently asked questions
- How many hours is Chicago from Kolkata?
- Kolkata is 10h 30m ahead of Chicago right now.
- What time is 9:00 AM Chicago in Kolkata?
- 9:00 AM in Chicago is 7:30 PM in Kolkata.
- What time is 5:00 PM Chicago in Kolkata?
- 5:00 PM in Chicago is 3:30 AM (next day) in Kolkata.
- When do Chicago and Kolkata business hours overlap?
- Standard 9 AM - 5 PM working hours in Chicago and Kolkata do not overlap. You will need an early or late call.
- Does daylight saving time change the difference between Chicago and Kolkata?
- 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 Chicago
Local time page
Time in Kolkata