🇦🇺 Perth ↔ 🇺🇸 San Francisco
Perth is usually 15 hours ahead of San Francisco. San Francisco observes daylight saving time and Perth does not, so the difference shifts by an hour around the changeovers.
Sunrise 7:18 AMSunset 5:21 PM(local)
Sunrise 5:49 AMSunset 8:36 PM(local)
🇦🇺 Perth
Dialing code+61
Population2,309,338
Coordinates31.95°S, 115.86°E
Elevation34 m
🇺🇸 San Francisco
Dialing code+1
Population827,526
Coordinates37.77°N, 122.42°W
Elevation16 m
No comfortable common working hours — these cities barely overlap.
Working hours assumed 9:00–18:00.
Frequently asked questions
- What is the time difference between Perth and San Francisco?
- Perth is 15 hours ahead of San Francisco. Use the side-by-side clocks and the day/night strips above to convert any hour between them.
- When is the best time to call between Perth and San Francisco?
- There is no hour when standard working hours (9:00–18:00) overlap in both Perth and San Francisco, so any call falls outside business hours for at least one side.
- Why does the time difference between Perth and San Francisco change?
- Because at least one of Perth and San Francisco observes daylight saving time, the difference shifts by an hour when one city changes its clocks and the other has not yet (or does not).