Newcastle is usually 15 hours ahead of Philadelphia. Both observe daylight saving time, so the difference shifts by an hour for a few weeks around the spring and autumn changeovers.

NewcastlePhiladelphia

Sunrise 6:25 AMSunset 6:59 PM(local)

Sunrise 7:01 AMSunset 6:38 PM(local)

Newcastle: daylight saving timeNow UTC+11. Next change: April 4, 2027 β€” clocks go back 1 hour.
Philadelphia: daylight saving timeNow UTC-4 EDT. Next change: November 1, 2026 β€” clocks go back 1 hour.
NewcastleUTC+11
PhiladelphiaUTC-4EDT

πŸ‡¦πŸ‡Ί Newcastle

Dialing code+61
Population508,437
Coordinates32.93Β°S, 151.78Β°E
Elevation48 m

πŸ‡ΊπŸ‡Έ Philadelphia

Dialing code+1
Population1,573,916
Coordinates39.95Β°N, 75.16Β°W
Elevation12 m

No comfortable common working hours β€” these cities barely overlap.

1 November 2026 β€” 3 April 2027: the gap is 16h instead of the usual 15h β€” Newcastle and Philadelphia change clocks on different days.

Working hours assumed 9:00–18:00.

Frequently asked questions

What is the time difference between Newcastle and Philadelphia?
Newcastle is 15 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 Newcastle and Philadelphia?
There is no hour when standard working hours (9:00–18:00) overlap in both Newcastle and Philadelphia, so any call falls outside business hours for at least one side.
Why does the time difference between Newcastle and Philadelphia change?
Because Newcastle and Philadelphia switch to or from daylight saving time on different dates, the gap between them is temporarily larger or smaller for a few weeks around those changes.