Time Difference Between O'Fallon and Sydney
Sydney is 15 hours ahead O'Fallon.
United States
O'Fallon
America/Chicago · UTC-5
Australia
Sydney
Australia/Sydney · UTC+10
Best Times to Meet
Hours where standard working time (9 AM – 6 PM) overlaps in both O'Fallon and Sydney.
Standard working hours don't overlap between O'Fallon and Sydney. Consider early-morning calls in O'Fallon or late-evening calls in Sydney.
O'Fallon to Sydney — 24-Hour Conversion
Each row shows the equivalent local time in Sydney for an hour in O'Fallon. Working-hours rows (9–18) are highlighted.
| O'Fallon | Sydney | Match |
|---|---|---|
| Workday in Sydney | ||
| Workday in Sydney | ||
| Workday in Sydney | ||
| Off hours | ||
| Off hours | ||
| Off hours | ||
| Off hours | ||
| Off hours | ||
| Off hours | ||
| +1 day | Workday in O'Fallon | |
| +1 day | Workday in O'Fallon | |
| +1 day | Workday in O'Fallon | |
| +1 day | Workday in O'Fallon | |
| +1 day | Workday in O'Fallon | |
| +1 day | Workday in O'Fallon | |
| +1 day | Workday in O'Fallon | |
| +1 day | Workday in O'Fallon | |
| +1 day | Workday in O'Fallon | |
| +1 day | Workday in Sydney | |
| +1 day | Workday in Sydney | |
| +1 day | Workday in Sydney | |
| +1 day | Workday in Sydney | |
| +1 day | Workday in Sydney | |
| +1 day | Workday in Sydney |
Frequently Asked Questions
What is the time difference between O'Fallon and Sydney?
Sydney, Australia (UTC+10) is 15 hours ahead O'Fallon, United States (UTC-5).
What is the best time to schedule a meeting between O'Fallon and Sydney?
The best meeting times overlap when both cities are within standard working hours (9 AM – 6 PM). The full hour-by-hour table on this page lists every overlap window.
Does daylight saving time change the difference between O'Fallon and Sydney?
Yes — when one city observes daylight saving time and the other does not, the gap shifts by an hour. The conversion table on this page reflects the current offset, including any active DST.
When it is 9 AM in O'Fallon, what time is it in Sydney?
Use the conversion table on this page — every hour in O'Fallon is mapped to its equivalent local time in Sydney, including day shift markers when the date differs.