What is the time difference between Chicago and Mumbai?

Mumbai is 10 hours 30 minutes ahead of Chicago. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Mumbai from Chicago?

There is no time inside normal working hours in both cities, so someone has to take the call outside them. The nearest workable windows are listed above — pick one and alternate who gets the awkward slot.

Does Chicago observe daylight saving time?

Yes. Chicago runs on UTC-6 in winter and UTC-5 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.

Does Mumbai observe daylight saving time?

No. Mumbai stays on UTC+5:30 all year, so its clocks never move.

If it is midday in Chicago, what time is it in Mumbai?

It is 22:30 in Mumbai, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Chicago and Mumbai use?

Chicago uses America/Chicago, currently UTC-5 (CDT), and Mumbai uses Asia/Kolkata, currently UTC+5:30 (IST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Chicago time to Mumbai time

Mumbai is 10 hours 30 minutes ahead of Chicago right now, so midday in Chicago lands in the late night in Mumbai.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

The whole day mapped across: read down the left for Chicago, across for Mumbai.

Chicago	Mumbai
00:00	10:30
01:00	11:30
02:00	12:30
03:00	13:30
04:00	14:30
05:00	15:30
06:00	16:30
07:00	17:30
08:00	18:30
09:00	19:30
10:00	20:30
11:00	21:30
12:00	22:30
13:00	23:30
14:00	00:30next day
15:00	01:30next day
16:00	02:30next day
17:00	03:30next day
18:00	04:30next day
19:00	05:30next day
20:00	06:30next day
21:00	07:30next day
22:00	08:30next day
23:00	09:30next day

Daylight saving time

Mumbai keeps one offset all year while Chicago moves twice. That is the whole reason this difference is seasonal.

Chicago

Observes daylight saving time

Standard: UTC-6
Daylight: UTC-5
Next change: 2026-11-01 −60m

Mumbai

Does not observe daylight saving time

Standard: UTC+5:30

When you can actually talk

A standard working day in Chicago and one in Mumbai do not overlap at all. Any call between them is early for one side or late for the other.

Chicago 22:30–07:30Mumbai 09:00–18:00
Chicago 09:00–18:00Mumbai 19:30–04:30

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

	Chicago	Mumbai
IANA zone	America/Chicago	Asia/Kolkata
Abbreviation	CDT	IST
Standard offset	UTC-6	UTC+5:30
Daylight offset	UTC-5	—
Clock changes this year	2	0
Country	United States	India

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Chicago and Mumbai?: Mumbai is 10 hours 30 minutes ahead of Chicago. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Mumbai from Chicago?: There is no time inside normal working hours in both cities, so someone has to take the call outside them. The nearest workable windows are listed above — pick one and alternate who gets the awkward slot.
Does Chicago observe daylight saving time?: Yes. Chicago runs on UTC-6 in winter and UTC-5 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.
Does Mumbai observe daylight saving time?: No. Mumbai stays on UTC+5:30 all year, so its clocks never move.
If it is midday in Chicago, what time is it in Mumbai?: It is 22:30 in Mumbai, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Chicago and Mumbai use?: Chicago uses America/Chicago, currently UTC-5 (CDT), and Mumbai uses Asia/Kolkata, currently UTC+5:30 (IST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.