Sydney zone
GMT+10 (GMT+10)
Chicago zone
CDT (GMT-5)
Difference
15 hours behind Sydney
Business overlap
No 9-5 overlap
Working hours overlap
Each cell is one hour in Sydney. Filled cells mark when 9 AM – 5 PM in Sydney and Chicago both apply.
0 hours per day
- Sydney
- GMT+10
- Chicago
- GMT-5
- Difference
- -15h
- Business overlap
- 0h
Hour-by-hour conversion
Each row shows the matching local time in Chicago for an hour in Sydney.
| Sydney | Chicago | Day | Window |
|---|---|---|---|
| 12:00 AM | 9:00 AM | previous day | — |
| 1:00 AM | 10:00 AM | previous day | — |
| 2:00 AM | 11:00 AM | previous day | — |
| 3:00 AM | 12:00 PM | previous day | — |
| 4:00 AM | 1:00 PM | previous day | — |
| 5:00 AM | 2:00 PM | previous day | — |
| 6:00 AM | 3:00 PM | previous day | — |
| 7:00 AM | 4:00 PM | previous day | — |
| 8:00 AM | 5:00 PM | previous day | — |
| 9:00 AM | 6:00 PM | previous day | — |
| 10:00 AM | 7:00 PM | previous day | — |
| 11:00 AM | 8:00 PM | previous day | — |
| 12:00 PM | 9:00 PM | previous day | — |
| 1:00 PM | 10:00 PM | previous day | — |
| 2:00 PM | 11:00 PM | previous day | — |
| 3:00 PM | 12:00 AM | same day | — |
| 4:00 PM | 1:00 AM | same day | — |
| 5:00 PM | 2:00 AM | same day | — |
| 6:00 PM | 3:00 AM | same day | — |
| 7:00 PM | 4:00 AM | same day | — |
| 8:00 PM | 5:00 AM | same day | — |
| 9:00 PM | 6:00 AM | same day | — |
| 10:00 PM | 7:00 AM | same day | — |
| 11:00 PM | 8:00 AM | same day | — |
Best meeting windows
Standard 9 AM – 5 PM hours in Sydney and Chicago do not overlap. Plan calls for early Sydney morning or late Sydney evening, and rotate the burden between sides.
Tighter overlap is achievable by having the side with later working hours start earlier, or by treating the first and last hours of each side as flexible. The bar above marks every hour where both cities sit inside a 9 AM – 5 PM window.
About converting Sydney time to Chicago time
Sydney follows the Australia/Sydney time zone (currently GMT+10, GMT+10), while Chicago follows America/Chicago (currently CDT, GMT-5). Chicago is 15 hours behind Sydney right now.
Both cities observe daylight saving time. If their transition weekends differ, the offset shifts by one hour for a few weeks each spring and autumn.
Daylight saving transitions in 2026
Sydney
- Fall back · Sunday, April 5, 2026
- Spring forward · Sunday, October 4, 2026
Chicago
- Spring forward · Sunday, March 8, 2026
- Fall back · Sunday, November 1, 2026
Reverse this conversion
Chicago to Sydney
Open the converter
Plan a meeting between Sydney and Chicago
More conversions from Sydney
Frequently asked questions
- How many hours is Sydney from Chicago?
- Chicago is 15 hours behind Sydney right now.
- What time is 9:00 AM Sydney in Chicago?
- 9:00 AM in Sydney is 6:00 PM (previous day) in Chicago.
- What time is 5:00 PM Sydney in Chicago?
- 5:00 PM in Sydney is 2:00 AM in Chicago.
- When do Sydney and Chicago business hours overlap?
- Standard 9 AM - 5 PM working hours in Sydney and Chicago do not overlap. You will need an early or late call.
- Does daylight saving time change the difference between Sydney and Chicago?
- Both Sydney and Chicago observe daylight saving time. If their transition dates differ, the offset between them shifts by an hour for a few weeks each year.
Local time page
Time in Sydney
Local time page
Time in Chicago