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Global ClockTime zone converter & meeting planner
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Working hours
Start
09
End
18
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AUTO follows the operating system. Working hours drive the green banding on every grid. All four persist on this device only.

Time in Chicago vs Sydney

Chicago keeps CDT (UTC−5) and Sydney keeps AEST (UTC+10) today. Sydney is 15 hours ahead of Chicago; the rows below read both clocks live.

The working day, side by side

The working days do not meet. there is no working-hour overlap with Sydney — the nearest workable window is 17:00–18:00 your time (08:00 there).

Chicago and Sydney hour by hour, with the working-hour overlap shaded
City00:00 in Chicago01:00 in Chicago02:00 in Chicago03:00 in Chicago04:00 in Chicago05:00 in Chicago06:00 in Chicago07:00 in Chicago08:00 in Chicago09:00 in Chicago10:00 in Chicago11:00 in Chicago12:00 in Chicago13:00 in Chicago14:00 in Chicago15:00 in Chicago16:00 in Chicago17:00 in Chicago18:00 in Chicago19:00 in Chicago20:00 in Chicago21:00 in Chicago22:00 in Chicago23:00 in Chicago
Chicago——000102030405060708091011121314151617181920212223
Sydney——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with Chicago and Sydney

Open in the PlannerAdd more cities, find a meeting time that works for everyone, then share it as a link.Open in Watch ViewKeep Chicago, Sydney and other cities on screen as live clocks, under an animated sky and sun.

Best hours to call

there is no working-hour overlap with Sydney — the nearest workable window is 17:00–18:00 your time (08:00 there).

Where daylight saving pulls them apart

Chicago next changes on Sunday 1 November 2026. Sydney next changes on Sunday 4 October 2026. Between those two dates the gap between the cities is an hour different from the one shown above — which is exactly when a recurring meeting drifts. Every date we track is on the daylight saving page.

Also useful

Common questions

How many hours ahead is Sydney of Chicago?

Sydney is 15 hours ahead of Chicago right now. The gap is not fixed: it moves whenever either side changes its clocks.

What is the best time to call between Chicago and Sydney?

There is no hour inside working hours in both cities. 17:00–18:00 your time (08:00 there) is the cheapest compromise, and one side is taking a shoulder hour.

Do Chicago and Sydney change clocks on the same date?

No. Chicago changes on 1 November 2026 and Sydney on 4 October 2026, so the gap moves by an hour in between.