Live · calculated from the IANA time-zone database

Time difference between Chicago and Sydney

Short answer

Sydney is 15 hours ahead of Chicago. Right now it is 07:33 in Chicago (CDT, UTC−5) and 22:33 in Sydney (GMT+10, UTC+10).

Right now

Chicago · United States

07:33

Tuesday, September 15, 2026

Central Daylight Time · CDT · UTC−5

Sydney · Australia

22:33

Tuesday, September 15, 2026

Australian Eastern Standard Time · GMT+10 · UTC+10

Times at the moment this page was generated. Reload for a fresh reading.

Does the difference between Chicago and Sydney change during the year?

Yes. For 182 days of 2026 the difference is 15 hours, but it moves whenever Chicago or Sydney enters or leaves daylight saving time. Here is the full 2026 calendar (dates in UTC):

From	Until	Sydney vs Chicago
January 1	March 8	+17 h
March 8	April 4	+16 h
April 4	October 3	+15 h
October 3	November 1	+16 h
November 1	December 31	+17 h

The highlighted row is the current period. Every date comes from each zone's official rules, not from a hand-typed table.

Best time to call Sydney from Chicago (and vice versa)

With 15 hours between them there is no hour at which Chicago and Sydney are both inside a 9:00–17:00 working day. Teams split across these two cities usually alternate the sacrifice: one week the meeting lands early (7:00–8:00) in Chicago and late (18:00–19:00) in the other city, the next week the other way round. The Timezone Matcher grid shades exactly those compromise hours.

Chicago to Sydney conversion table

Each Chicago hour and its equivalent in Sydney today. Rows shaded green are working hours (9:00–17:00) in both cities at once.

Chicago time · Tue, Sep 15	Sydney time
00:00	15:00
01:00	16:00
02:00	17:00
03:00	18:00
04:00	19:00
05:00	20:00
06:00	21:00
07:00	22:00
08:00	23:00
09:00	00:00next day
10:00	01:00next day
11:00	02:00next day
12:00	03:00next day
13:00	04:00next day
14:00	05:00next day
15:00	06:00next day
16:00	07:00next day
17:00	08:00next day
18:00	09:00next day
19:00	10:00next day
20:00	11:00next day
21:00	12:00next day
22:00	13:00next day
23:00	14:00next day

Looking for it the other way round? This page covers both directions: Sydney to Chicago is the same difference with the sign flipped.

The two time zones

Chicago — America/Chicago

Chicago follows Central Time (CT): UTC−6 in winter (CST) and UTC−5 in summer (CDT), shared with Dallas, Houston and most of the US Midwest and South.

Sydney — Australia/Sydney

Sydney uses Australian Eastern Time: UTC+10 in winter (AEST) and UTC+11 in summer (AEDT), from the first Sunday of October to the first Sunday of April — opposite to the northern hemisphere.

Frequently asked questions

How many hours difference between Chicago and Sydney?

Sydney is 15 hours ahead of Chicago. For most of the year (182 days) the difference is 15 hours; it shifts during the weeks when one of the two cities enters or leaves daylight saving time.

When it is 12:00 noon in Chicago, what time is it in Sydney?

03:00 in Sydney the next day (at today's difference of 15 hours).

What is the best time for a meeting between Chicago and Sydney?

There is no overlap between the 9:00–17:00 working days of Chicago and Sydney. Teams usually alternate: an early-morning slot in Chicago lands in the late evening of the other city.

Do Chicago and Sydney observe daylight saving time?

Chicago: yes. Sydney: yes. Both change, but not necessarily on the same dates — see the transitions section on this page.

What time zone is Chicago in? And Sydney?

Chicago: Central Daylight Time (America/Chicago, UTC−5). Sydney: Australian Eastern Standard Time (Australia/Sydney, UTC+10).

Tools

Meeting grid — add both cities and click a slot

Time zone converter — any city, any time

Working hours overlap calculator

Daylight saving time 2027 — all dates