Best Meeting Time: Sydney to Chicago
🕐 Live Timezone Overlap: Sydney & Chicago
Sydney and Chicago sit 15 hours apart, with Chicago behind. That gap is wide enough that a standard 9am–6pm working day in Sydney corresponds to the previous evening in Chicago, and vice versa. There is no overlap between the two cities' working hours. Every meeting therefore requires at least one side to step outside normal hours, so agreeing early on who carries that burden is the first practical decision any cross-city team must make.
Time Difference: Sydney and Chicago
Chicago is currently 15 hours behind Sydney. The live offsets are Sydney UTC+10 and Chicago UTC-5. Sydney observes daylight saving and Chicago also observes daylight saving, so the offset shifts twice a year if both sides aren't already aligned.
Sydney currently observes UTC+10. Chicago is currently on UTC-5, giving a gap of 15 hours. Both cities observe DST, but their changeover weekends differ. Sydney switches to AEDT (UTC+11) on the first Sunday in October and reverts in early April. Chicago follows US federal DST. When Sydney is on AEDT and Chicago has not yet moved, or has already reverted, the gap shifts to 16 hours. Teams should check both calendars around each changeover to avoid miscalculating call times.
Best Times to Meet
There are 0 overlap hours between Sydney and Chicago working days. No window exists where both offices are simultaneously open on a 9am–6pm basis. In practice, one team must meet outside standard hours. A Sydney participant joining at 7am catches Chicago at 4pm the previous day. Alternatively, a Chicago participant staying until 7pm or 8pm Central reaches Sydney at 10am or 11am the following morning. The Sydney side carries less disruption when accepting early starts rather than late finishes, given Sydney's generally earlier working rhythm.
Working Hours Overlap Explained
Sydney operates on Australia/Sydney (currently UTC+10). Chicago operates on America/Chicago (currently UTC-5). The table below maps a standard 9:00 AM–6:00 PM day in Sydney to Chicago's local time.
| Sydney time | Chicago time | Status |
|---|---|---|
| 9:00 AM | 6:00 PM | Chicago wrapping up |
| 10:00 AM | 7:00 PM | Chicago outside hours |
| 11:00 AM | 8:00 PM | Chicago outside hours |
| 12:00 PM | 9:00 PM | Chicago outside hours |
| 1:00 PM | 10:00 PM | Chicago outside hours |
| 2:00 PM | 11:00 PM | Chicago outside hours |
| 3:00 PM | 12:00 AM | Chicago outside hours |
| 4:00 PM | 1:00 AM | Chicago outside hours |
| 5:00 PM | 2:00 AM | Chicago outside hours |
| 6:00 PM | 3:00 AM | Chicago outside hours |
Tips for Scheduling Across Sydney and Chicago
- Agree once which city takes the out-of-hours slot; revisit quarterly so the burden rotates fairly.
- Sydney's Christmas-to-Australia Day period runs on skeleton staff; avoid scheduling critical reviews then.
- Chicago trading desks at CME and CBOE start at 7am Central, so finance contacts may be reachable earlier than expected.
- Around DST changeovers, verify the gap is 15 or 16 hours before sending calendar invites to either Sydney or Chicago colleagues.
- A 7am Sydney start reaches Chicago at 4pm the previous afternoon, the cleanest low-disruption slot for both sides.
Public Holidays and Working Weeks
Both cities follow a Monday-to-Friday working week. Sydney's next notable public holidays are Australia Day (26 January) and ANZAC Day (25 April). Chicago's calendar includes Independence Day (4 July), Thanksgiving (fourth Thursday in November), and Christmas Day (25 December), which coincides with Sydney's own Christmas holiday. The Christmas-to-Australia Day window is particularly thin in Sydney, as offices run on skeleton staff through that summer holiday period. Build both holiday calendars into any recurring meeting schedule.