Chicago and Sydney working-hours overlap
On Monday, 28 September 2026, Chicago is 15 hours behind Sydney — UTC-05:00 against UTC+10:00. They share no working hours that day at all: Chicago works 14:00–22:00 UTC and Sydney works 23:00–07:00 UTC, and those two windows do not meet. Chicago changes clocks on Sunday, 1 November 2026, and the gap between them goes from 16 hours to 17 hours. Sydney changes clocks on Sunday, 4 October 2026, and the gap between them goes from 15 hours to 16 hours.
Every figure on this page describes Monday, 28 September 2026 — a fixed day, not the day you are reading it. Working hours are 09:00–17:00 local time for both cities; change either, or pick another date, in the overlap calculator.
Shared working hours
No shared working hours on this date.
On this date the two working days do not meet, and none of the twelve months sampled for the year brings them together. Widening one side’s hours is what would change it; no other date will find a window that is not there.
Each city's working day
| City | Local hours | In UTC | Offset | Next clock change |
|---|---|---|---|---|
| Chicago | 09:00–17:00 | 14:00–22:00 UTC | UTC-05:00 | UTC-05:00 → UTC-06:00, 1 Nov 2026 |
| Sydney | 09:00–17:00 | 23:00–07:00 UTC | UTC+10:00 | UTC+10:00 → UTC+11:00, 4 Oct 2026 |
Is there any overlap through the year?
Chicago and Sydney change clocks on different dates, so the gap between them moves twice a year. In the twelve months sampled the two working days never meet, so there is no window to move.
| Month | Shared window | Length |
|---|---|---|
| 2026-10 | No shared hours | — |
| 2026-11 | No shared hours | — |
| 2026-12 | No shared hours | — |
| 2027-01 | No shared hours | — |
| 2027-02 | No shared hours | — |
| 2027-03 | No shared hours | — |
| 2027-04 | No shared hours | — |
| 2027-05 | No shared hours | — |
| 2027-06 | No shared hours | — |
| 2027-07 | No shared hours | — |
| 2027-08 | No shared hours | — |
| 2027-09 | No shared hours | — |
Questions
- Is there any time Chicago and Sydney are both at work?
- Not on Monday, 28 September 2026. Chicago works 14:00–22:00 UTC and Sydney works 23:00–07:00 UTC, and those windows do not overlap. Widening one side's hours or choosing another date is what changes that.
- How far apart are Chicago and Sydney?
- On Monday, 28 September 2026, Chicago is 15 hours behind Sydney — UTC-05:00 against UTC+10:00. Chicago changes clocks on Sunday, 1 November 2026, and the gap between them goes from 16 hours to 17 hours. Sydney changes clocks on Sunday, 4 October 2026, and the gap between them goes from 15 hours to 16 hours.
- Does the overlap between Chicago and Sydney change through the year?
- There is no month in the twelve months from Monday, 28 September 2026 when Chicago and Sydney are both inside their working hours. Chicago changes clocks on Sunday, 1 November 2026, and the gap between them goes from 16 hours to 17 hours. Sydney changes clocks on Sunday, 4 October 2026, and the gap between them goes from 15 hours to 16 hours.
Related city pairs
- Honolulu and Chicago
- Honolulu and Sydney
- San Francisco and Chicago
- San Francisco and Sydney
- Denver and Chicago
- Denver and Sydney
Or read how overlap is calculated and the other questions people ask about scheduling across time zones.