Philadelphia to Seoul Time Difference
Seoul is 13 hours ahead of Philadelphia. When it's 08:58:16 AM in Philadelphia, it's 09:58:16 PM in Seoul.
How Many Hours Ahead Is Seoul From Philadelphia?
Seoul is 13 hours ahead of Philadelphia. So Philadelphia is 13 hours behind Seoul looking the other way — the same gap, described from the other end.
In practice that means a working day in Philadelphia starts when it is already 10:00 PM in Seoul. The gap is not fixed all year: it becomes 14 hours on Sunday, November 1, 2026, when Philadelphia changes its clocks.
Best Time to Call Philadelphia and Seoul
Standard 9-to-5 hours in Philadelphia and Seoul never overlap, so someone has to take the call outside their working day. The most workable window is 6:00 PM to 10:00 PM in Philadelphia, which is 7:00 AM to 11:00 AM in Seoul.
both at work Philadelphia only Seoul only neither — hours shown along the strip are Philadelphia local time.
Convert a Specific Time
Pick any date and time in Philadelphia to see the exact equivalent in Seoul.
Common Times Converted
Philadelphia time on the left, Seoul time on the right.
Philadelphia to Seoul: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Philadelphia. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Philadelphia | Seoul | Working hours |
|---|---|---|
| 12:00 AM | 1:00 PM | Seoul only |
| 1:00 AM | 2:00 PM | Seoul only |
| 2:00 AM | 3:00 PM | Seoul only |
| 3:00 AM | 4:00 PM | Seoul only |
| 4:00 AM | 5:00 PM | — |
| 5:00 AM | 6:00 PM | — |
| 6:00 AM | 7:00 PM | — |
| 7:00 AM | 8:00 PM | — |
| 8:00 AM | 9:00 PM | — |
| 9:00 AM | 10:00 PM | Philadelphia only |
| 10:00 AM | 11:00 PM | Philadelphia only |
| 11:00 AM | 12:00 AM next day | Philadelphia only |
| 12:00 PM | 1:00 AM next day | Philadelphia only |
| 1:00 PM | 2:00 AM next day | Philadelphia only |
| 2:00 PM | 3:00 AM next day | Philadelphia only |
| 3:00 PM | 4:00 AM next day | Philadelphia only |
| 4:00 PM | 5:00 AM next day | Philadelphia only |
| 5:00 PM | 6:00 AM next day | — |
| 6:00 PM | 7:00 AM next day | — |
| 7:00 PM | 8:00 AM next day | — |
| 8:00 PM | 9:00 AM next day | Seoul only |
| 9:00 PM | 10:00 AM next day | Seoul only |
| 10:00 PM | 11:00 AM next day | Seoul only |
| 11:00 PM | 12:00 PM next day | Seoul only |
Understanding the Philadelphia – Seoul Time Difference
Philadelphia runs on America/New_York, currently EDT (UTC-4:00). Seoul runs on Asia/Seoul, currently KST (UTC+9:00). The gap of 13 hours is simply the distance between those two offsets.
Philadelphia observes Daylight Saving Time and Seoul does not, so the gap between them shifts by an hour twice a year. The next shift is on Sunday, November 1, 2026, when Philadelphia adjusts its clocks and the difference becomes 14 hours. Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in the United States.
Philadelphia today
Seoul today
Frequently Asked Questions
What is the time difference between Philadelphia and Seoul?
Seoul is currently 13 hours ahead of Philadelphia. That gap becomes 14 hours on Sunday, November 1, 2026, when Philadelphia changes its clocks.
How many hours ahead is Seoul from Philadelphia?
Seoul is 13 hours ahead of Philadelphia. Looking at it the other way, Philadelphia is 13 hours behind Seoul.
What time is it in Seoul when it is 9:00 AM in Philadelphia?
When it is 9:00 AM in Philadelphia, it is 10:00 PM in Seoul.
Is Seoul ahead of or behind Philadelphia?
Seoul is 13 hours ahead of Philadelphia. Seoul reaches each point in the day first, so its working day is already finishing while Philadelphia is still getting started.
What is the best time to call between Philadelphia and Seoul?
Standard business hours in Philadelphia and Seoul do not overlap at all, so one side has to step outside the 9-to-5. The most workable window is 6:00 PM to 10:00 PM in Philadelphia, which is 7:00 AM to 11:00 AM in Seoul.
Does the time difference between Philadelphia and Seoul change during the year?
Yes. Philadelphia observes Daylight Saving Time and Seoul does not, so the gap between them shifts during the year. It changes to 14 hours on Sunday, November 1, 2026.
What time zones are Philadelphia and Seoul in?
Philadelphia uses the America/New_York time zone, currently EDT (UTC-4:00). Seoul uses Asia/Seoul, currently KST (UTC+9:00).