Chicago is currently 15 hours behind Sydney. Convert time between Chicago and Sydney, see the exact difference, and find the best hours for calls and meetings.
Chicago uses Central Daylight Time. Sydney uses Australian Eastern Standard Time. Chicago time is 15 hours behind Sydney. So, when it is 12:00 AM in Chicago, it is 3:00 PM in Sydney.
Common Chicago times and their Sydney equivalents.
| Chicago Time | Sydney Time |
|---|---|
| 12:00 AM Chicago | 3:00 PM Sydney |
| 1:00 AM Chicago | 4:00 PM Sydney |
| 2:00 AM Chicago | 5:00 PM Sydney |
| 3:00 AM Chicago | 6:00 PM Sydney |
| 4:00 AM Chicago | 7:00 PM Sydney |
| 5:00 AM Chicago | 8:00 PM Sydney |
| 6:00 AM Chicago | 9:00 PM Sydney |
| 7:00 AM Chicago | 10:00 PM Sydney |
| 8:00 AM Chicago | 11:00 PM Sydney |
| 9:00 AM Chicago | 12:00 AM Sydney |
| 10:00 AM Chicago | 1:00 AM Sydney |
| 11:00 AM Chicago | 2:00 AM Sydney |
| 12:00 PM Chicago | 3:00 AM Sydney |
| 1:00 PM Chicago | 4:00 AM Sydney |
| 2:00 PM Chicago | 5:00 AM Sydney |
| 3:00 PM Chicago | 6:00 AM Sydney |
| 4:00 PM Chicago | 7:00 AM Sydney |
| 5:00 PM Chicago | 8:00 AM Sydney |
| 6:00 PM Chicago | 9:00 AM Sydney |
| 7:00 PM Chicago | 10:00 AM Sydney |
| 8:00 PM Chicago | 11:00 AM Sydney |
| 9:00 PM Chicago | 12:00 PM Sydney |
| 10:00 PM Chicago | 1:00 PM Sydney |
| 11:00 PM Chicago | 2:00 PM Sydney |
Chicago uses Central Time — Central Standard Time (CST, UTC−6) in winter and Central Daylight Time (CDT, UTC−5) in summer, shifting on the same US DST schedule. It sits one hour behind Eastern Time and two hours ahead of Pacific, placing it in the heart of US business scheduling overlap.
Sydney uses Australian Eastern Standard Time (AEST, UTC+10) in winter and Australian Eastern Daylight Time (AEDT, UTC+11) in summer. Because Australia is in the Southern Hemisphere, its summer runs October–April — the opposite of the Northern Hemisphere. Clocks go forward on the first Sunday of October and back on the first Sunday of April.
Both Chicago and Sydney may observe Daylight Saving Time, which means the offset between them can change twice a year. Here is what to expect each season.
| Period | Note | Chicago | Sydney | Offset |
|---|---|---|---|---|
| Nov – Mar | Both on standard time | CST (UTC−6) | GMT+11 (UTC+11) | 17 hours |
| Mar – late Mar | US clocks forward, some zones still on standard | CDT (UTC−5) | GMT+11 (UTC+11) | 16 hours |
| Late Mar – Oct current | Both on summer / daylight time | CDT (UTC−5) | GMT+10 (UTC+10) | 15 hours |
| Late Oct – early Nov | Clocks transitioning — check exact date | CST (UTC−6) | GMT+11 (UTC+11) | 17 hours |
The transition window typically lasts 1–2 weeks in spring and autumn. If you have a recurring weekly meeting near a clock change, verify the exact date to avoid a missed call.
Chicago is currently 15 hours behind Sydney. Chicago uses Central Daylight Time (UTC−5) and Sydney uses Australian Eastern Standard Time (UTC+10).
Chicago and Sydney have no standard 9 am–6 pm business-hour overlap. Consider scheduling during early morning or late evening, or use a rotating schedule to share the inconvenience.
When it is 9:00 AM in Chicago, it is 12:00 am in Sydney (previous day). Chicago is 15 hours behind Sydney.
When it is 5:00 PM in Sydney, it is 2:00 am in Chicago.
Both Chicago and Sydney observe Daylight Saving Time, but their transitions may not happen on the same date. During the brief 1–2 week windows in spring and autumn when only one zone has changed clocks, the offset between the two cities shifts by one hour. For most of the year the difference is 15 hours, but double-check the transition dates if you have a recurring meeting scheduled near those windows.