Chicago zone
CDT (GMT-5)
Sydney zone
GMT+10 (GMT+10)
Difference
15 hours ahead of Chicago
Business overlap
No 9-5 overlap
Working hours overlap
Each cell is one hour in Chicago. Filled cells mark when 9 AM – 5 PM in Chicago and Sydney both apply.
0 hours per day
- Chicago
- GMT-5
- Sydney
- GMT+10
- Difference
- +15h
- Business overlap
- 0h
Hour-by-hour conversion
Each row shows the matching local time in Sydney for an hour in Chicago.
| Chicago | Sydney | Day | Window |
|---|---|---|---|
| 12:00 AM | 3:00 PM | same day | — |
| 1:00 AM | 4:00 PM | same day | — |
| 2:00 AM | 5:00 PM | same day | — |
| 3:00 AM | 6:00 PM | same day | — |
| 4:00 AM | 7:00 PM | same day | — |
| 5:00 AM | 8:00 PM | same day | — |
| 6:00 AM | 9:00 PM | same day | — |
| 7:00 AM | 10:00 PM | same day | — |
| 8:00 AM | 11:00 PM | same day | — |
| 9:00 AM | 12:00 AM | next day | — |
| 10:00 AM | 1:00 AM | next day | — |
| 11:00 AM | 2:00 AM | next day | — |
| 12:00 PM | 3:00 AM | next day | — |
| 1:00 PM | 4:00 AM | next day | — |
| 2:00 PM | 5:00 AM | next day | — |
| 3:00 PM | 6:00 AM | next day | — |
| 4:00 PM | 7:00 AM | next day | — |
| 5:00 PM | 8:00 AM | next day | — |
| 6:00 PM | 9:00 AM | next day | — |
| 7:00 PM | 10:00 AM | next day | — |
| 8:00 PM | 11:00 AM | next day | — |
| 9:00 PM | 12:00 PM | next day | — |
| 10:00 PM | 1:00 PM | next day | — |
| 11:00 PM | 2:00 PM | next day | — |
Best meeting windows
Standard 9 AM – 5 PM hours in Chicago and Sydney do not overlap. Plan calls for early Chicago morning or late Chicago 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 Chicago time to Sydney time
Chicago follows the America/Chicago time zone (currently CDT, GMT-5), while Sydney follows Australia/Sydney (currently GMT+10, GMT+10). Sydney is 15 hours ahead of Chicago 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
Chicago
- Spring forward · Sunday, March 8, 2026
- Fall back · Sunday, November 1, 2026
Sydney
- Fall back · Sunday, April 5, 2026
- Spring forward · Sunday, October 4, 2026
Reverse this conversion
Sydney to Chicago
Open the converter
Plan a meeting between Chicago and Sydney
More conversions from Chicago
Frequently asked questions
- How many hours is Chicago from Sydney?
- Sydney is 15 hours ahead of Chicago right now.
- What time is 9:00 AM Chicago in Sydney?
- 9:00 AM in Chicago is 12:00 AM (next day) in Sydney.
- What time is 5:00 PM Chicago in Sydney?
- 5:00 PM in Chicago is 8:00 AM (next day) in Sydney.
- When do Chicago and Sydney business hours overlap?
- Standard 9 AM - 5 PM working hours in Chicago and Sydney do not overlap. You will need an early or late call.
- Does daylight saving time change the difference between Chicago and Sydney?
- Both Chicago and Sydney 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 Chicago
Local time page
Time in Sydney