Time Difference Between Costa Mesa and Sydney
Sydney is 17 hours ahead Costa Mesa.
United States
Costa Mesa
America/Los_Angeles · UTC-7
Australia
Sydney
Australia/Sydney · UTC+10
Best Times to Meet
Hours where standard working time (9 AM – 6 PM) overlaps in both Costa Mesa and Sydney.
Costa Mesa
4:00 PM
Sydney
9:00 AM
Costa Mesa
5:00 PM
Sydney
10:00 AM
Costa Mesa to Sydney — 24-Hour Conversion
Each row shows the equivalent local time in Sydney for an hour in Costa Mesa. Working-hours rows (9–18) are highlighted.
| Costa Mesa | Sydney | Match |
|---|---|---|
| Workday in Sydney | ||
| Off hours | ||
| Off hours | ||
| Off hours | ||
| Off hours | ||
| Off hours | ||
| Off hours | ||
| +1 day | Off hours | |
| +1 day | Off hours | |
| +1 day | Workday in Costa Mesa | |
| +1 day | Workday in Costa Mesa | |
| +1 day | Workday in Costa Mesa | |
| +1 day | Workday in Costa Mesa | |
| +1 day | Workday in Costa Mesa | |
| +1 day | Workday in Costa Mesa | |
| +1 day | Workday in Costa Mesa | |
| +1 day | Best for meetings | |
| +1 day | Best for meetings | |
| +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 Costa Mesa and Sydney?
Sydney, Australia (UTC+10) is 17 hours ahead Costa Mesa, United States (UTC-7).
What is the best time to schedule a meeting between Costa Mesa 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 Costa Mesa 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 Costa Mesa, what time is it in Sydney?
Use the conversion table on this page — every hour in Costa Mesa is mapped to its equivalent local time in Sydney, including day shift markers when the date differs.