Best overlap: 5:00 PM to 6:00 PM in San Diego is 8:00 AM to 9:00 AM in Perth.
The best time to meet is 5:00 PM to 6:00 PM in San Diego, which is 8:00 AM to 9:00 AM in Perth. The shared window is only 1 hour — treat 5:00 PM in San Diego (8:00 AM in Perth) as the one fixed point and plan everything else around it. Worth a glance at the calendar — Perth is on the next day, so align on the date as well as the time. A quick caveat — San Diego's clocks move for daylight saving and Perth's don't, so the times here are right for only part of the year.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
San Diego America/Los Angeles | ||||||||||||||||||||||||
Perth Australia/Perth |
The US to Australia gap runs 14 to 19 hours depending on the month, and someone is always in tomorrow. Exact overlap windows for every US coast, the double-DST trap, and a rotation rule that keeps it fair. -