Observatory log
Kolkata and Chicago, compared
- 01Difference now
Chicago is 10 hours 30 minutes behind Kolkata.
Kolkata: IST (UTC+5:30) · Chicago: CDT (UTC−5)
Next changeFrom 1 November 2026: Chicago is 11 hours 30 minutes behind Kolkata.
- 02Through 2026–2027
- 1 January 2026 – 8 March 2026−11 h 30 min
- 8 March 2026 – 1 November 2026−10 h 30 min
- 1 November 2026 – 14 March 2027−11 h 30 min
- 14 March 2027 – 7 November 2027−10 h 30 min
- 7 November 2027 – 31 December 2027−11 h 30 min
Difference of Chicago from Kolkata. It changes on the days either place changes its clocks (dates local to that place).
- 03Shared working hours
Their working days never overlap.
Counted as 09:00–17:00 local time on each place’s own working days, for the next seven days.
- 04Best time to meet
19:30–22:00 in Kolkata = 09:00–11:30 in Chicago
No shared office hours: this is early or late for one side (Mon–Fri).
Also possible: Mon–Fri: 16:30–17:00 in Kolkata = 06:00–06:30 in Chicago · 30 min.
- 05Weekend
Kolkata: Saturday and Sunday
Chicago: Saturday and Sunday
24 hours
A day in Kolkata, in Chicago
| Kolkata | Chicago | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 13:30Yesterday | |
| 01:00 | 14:30Yesterday | |
| 02:00 | 15:30Yesterday | |
| 03:00 | 16:30Yesterday | |
| 04:00 | 17:30Yesterday | |
| 05:00 | 18:30Yesterday | |
| 06:00 | 19:30Yesterday | |
| 07:00 | 20:30Yesterday | |
| 08:00 | 21:30Yesterday | |
| 09:00 | 22:30Yesterday | |
| 10:00 | 23:30Yesterday | |
| 11:00 | 00:30 | |
| 12:00 | 01:30 | |
| 13:00 | 02:30 | |
| 14:00 | 03:30 | |
| 15:00 | 04:30 | |
| 16:00 | 05:30 | |
| 17:00 | 06:30 | |
| 18:00 | 07:30 | |
| 19:00 | 08:30 | |
| 20:00 | 09:30 | |
| 21:00 | 10:30 | |
| 22:00 | 11:30 | |
| 23:00 | 12:30 |
Working hoursEarly or eveningNightWeekend
Plan a meeting: Kolkata and Chicago
More time differences with Kolkata
More time differences with Chicago
Questions
Asked about Kolkata and Chicago
What is the time difference between Kolkata and Chicago?
Chicago is 10 hours 30 minutes behind Kolkata. This holds until 1 November 2026; then Chicago is 11 hours 30 minutes behind Kolkata.
What is the best time for a call between Kolkata and Chicago?
No shared office hours. The least awkward windows, early or late for one side: Mon–Fri: 19:30–22:00 in Kolkata = 09:00–11:30 in Chicago · 2 h 30 min; Mon–Fri: 16:30–17:00 in Kolkata = 06:00–06:30 in Chicago · 30 min.
When does the time difference between Kolkata and Chicago change?
In the next 12 months it changes on: 1 November 2026 (−11 h 30 min); 14 March 2027 (−10 h 30 min).