Sydney to Philadelphia Time Difference
Philadelphia is 15 hours behind Sydney. When it's 12:34:20 AM in Sydney, it's 09:34:20 AM in Philadelphia.
How Many Hours Behind Is Philadelphia From Sydney?
Philadelphia is 15 hours behind Sydney. So Sydney is 15 hours ahead of Philadelphia looking the other way — the same gap, described from the other end.
In practice that means a working day in Sydney starts when it is already 6:00 PM the previous day in Philadelphia. The gap is not fixed all year: it becomes 16 hours on Sunday, November 1, 2026, when Philadelphia changes its clocks.
Best Time to Call Sydney and Philadelphia
Standard 9-to-5 hours in Sydney and Philadelphia never overlap, so someone has to take the call outside their working day. The most workable window is 7:00 AM to 1:00 PM in Sydney, which is 4:00 PM to 10:00 PM in Philadelphia.
both at work Sydney only Philadelphia only neither — hours shown along the strip are Sydney local time.
Convert a Specific Time
Pick any date and time in Sydney to see the exact equivalent in Philadelphia.
Common Times Converted
Sydney time on the left, Philadelphia time on the right.
Sydney to Philadelphia: Full 24-Hour Conversion Table
Based on today, Monday, October 12, 2026 in Sydney. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Sydney | Philadelphia | Working hours |
|---|---|---|
| 12:00 AM | 9:00 AM prev day | Philadelphia only |
| 1:00 AM | 10:00 AM prev day | Philadelphia only |
| 2:00 AM | 11:00 AM prev day | Philadelphia only |
| 3:00 AM | 12:00 PM prev day | Philadelphia only |
| 4:00 AM | 1:00 PM prev day | Philadelphia only |
| 5:00 AM | 2:00 PM prev day | Philadelphia only |
| 6:00 AM | 3:00 PM prev day | Philadelphia only |
| 7:00 AM | 4:00 PM prev day | Philadelphia only |
| 8:00 AM | 5:00 PM prev day | — |
| 9:00 AM | 6:00 PM prev day | Sydney only |
| 10:00 AM | 7:00 PM prev day | Sydney only |
| 11:00 AM | 8:00 PM prev day | Sydney only |
| 12:00 PM | 9:00 PM prev day | Sydney only |
| 1:00 PM | 10:00 PM prev day | Sydney only |
| 2:00 PM | 11:00 PM prev day | Sydney only |
| 3:00 PM | 12:00 AM | Sydney only |
| 4:00 PM | 1:00 AM | Sydney only |
| 5:00 PM | 2:00 AM | — |
| 6:00 PM | 3:00 AM | — |
| 7:00 PM | 4:00 AM | — |
| 8:00 PM | 5:00 AM | — |
| 9:00 PM | 6:00 AM | — |
| 10:00 PM | 7:00 AM | — |
| 11:00 PM | 8:00 AM | — |
Understanding the Sydney – Philadelphia Time Difference
Sydney runs on Australia/Sydney, currently AEDT (UTC+11:00). Philadelphia runs on America/New_York, currently EDT (UTC-4:00). The gap of 15 hours is simply the distance between those two offsets.
Both cities observe Daylight Saving Time, but they don't switch on the same date — so for a few weeks each year the gap between them is different again. The next shift is on Sunday, November 1, 2026, when Philadelphia adjusts its clocks and the difference becomes 16 hours. Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in Australia · Daylight Saving Time in the United States.
Sydney today
Philadelphia today
Frequently Asked Questions
What is the time difference between Sydney and Philadelphia?
Philadelphia is currently 15 hours behind Sydney. That gap becomes 16 hours on Sunday, November 1, 2026, when Philadelphia changes its clocks.
How many hours behind is Philadelphia from Sydney?
Philadelphia is 15 hours behind Sydney. Looking at it the other way, Sydney is 15 hours ahead of Philadelphia.
What time is it in Philadelphia when it is 9:00 AM in Sydney?
When it is 9:00 AM in Sydney, it is 6:00 PM the previous day in Philadelphia.
Is Philadelphia ahead of or behind Sydney?
Philadelphia is 15 hours behind Sydney. Sydney reaches each point in the day first, so Philadelphia is still getting started while the Sydney working day is finishing.
What is the best time to call between Sydney and Philadelphia?
Standard business hours in Sydney and Philadelphia do not overlap at all, so one side has to step outside the 9-to-5. The most workable window is 7:00 AM to 1:00 PM in Sydney, which is 4:00 PM to 10:00 PM in Philadelphia.
Does the time difference between Sydney and Philadelphia change during the year?
Yes. Both cities observe Daylight Saving Time, and they do not always switch on the same date, so the gap between them shifts during the year. It changes to 16 hours on Sunday, November 1, 2026.
What time zones are Sydney and Philadelphia in?
Sydney uses the Australia/Sydney time zone, currently AEDT (UTC+11:00). Philadelphia uses America/New_York, currently EDT (UTC-4:00).