Time Difference Between Castro Valley and Sydney
Sydney is 17 hours ahead Castro Valley.
United States
Castro Valley
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 Castro Valley and Sydney.
Castro Valley
4:00 PM
Sydney
9:00 AM
Castro Valley
5:00 PM
Sydney
10:00 AM
Castro Valley to Sydney — 24-Hour Conversion
Each row shows the equivalent local time in Sydney for an hour in Castro Valley. Working-hours rows (9–18) are highlighted.
| Castro Valley | 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 Castro Valley | |
| +1 day | Workday in Castro Valley | |
| +1 day | Workday in Castro Valley | |
| +1 day | Workday in Castro Valley | |
| +1 day | Workday in Castro Valley | |
| +1 day | Workday in Castro Valley | |
| +1 day | Workday in Castro Valley | |
| +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 Castro Valley and Sydney?
Sydney, Australia (UTC+10) is 17 hours ahead Castro Valley, United States (UTC-7).
What is the best time to schedule a meeting between Castro Valley 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 Castro Valley 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 Castro Valley, what time is it in Sydney?
Use the conversion table on this page — every hour in Castro Valley is mapped to its equivalent local time in Sydney, including day shift markers when the date differs.