🇦🇺 Perth ↔ 🇺🇸 Philadelphia

Perth is usually 12 hours ahead of Philadelphia. Philadelphia 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 5:34 AMSunset 8:34 PM(local)

Philadelphia: daylight saving timeNow UTC-4 EDT. Next change: November 1, 2026 — clocks go back 1 hour.
PerthUTC+8
PhiladelphiaUTC-4EDT

🇦🇺 Perth

Dialing code+61
Population2,309,338
Coordinates31.95°S, 115.86°E
Elevation34 m

🇺🇸 Philadelphia

Dialing code+1
Population1,573,916
Coordinates39.95°N, 75.16°W
Elevation12 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 Philadelphia?
Perth is 12 hours ahead of Philadelphia. 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 Philadelphia?
There is no hour when standard working hours (9:00–18:00) overlap in both Perth and Philadelphia, so any call falls outside business hours for at least one side.
Why does the time difference between Perth and Philadelphia change?
Because at least one of Perth and Philadelphia 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).