Sydney is typically 18-19 hours ahead of Los Angeles. When it's 9:00 AM in Sydney, it's around 2:00 PM the previous day in LA. Both cities observe daylight saving time, but in opposite seasons (Southern vs Northern Hemisphere).
The time difference ranges from 17-19 hours depending on DST transitions. During US summer, Sydney is closer to 17 hours ahead; during Australian summer, it's closer to 19 hours.
Optimal meeting window: 3:00 PM - 6:00 PM Los Angeles time (10:00 AM - 1:00 PM Sydney next day). This catches morning business hours in Sydney.
Many tech companies and entertainment firms use late afternoon LA time for Sydney calls to maximize overlap.