Seoul to Jacksonville Time Difference
Jacksonville is 13 hours behind Seoul. When it's 11:20:15 PM in Seoul, it's 10:20:15 AM in Jacksonville.
How Many Hours Behind Is Jacksonville From Seoul?
Jacksonville is 13 hours behind Seoul. So Seoul is 13 hours ahead of Jacksonville looking the other way — the same gap, described from the other end.
In practice that means a working day in Seoul starts when it is already 8:00 PM the previous day in Jacksonville. The gap is not fixed all year: it becomes 14 hours on Sunday, November 1, 2026, when Jacksonville changes its clocks.
Best Time to Call Seoul and Jacksonville
Standard 9-to-5 hours in Seoul and Jacksonville never overlap, so someone has to take the call outside their working day. The most workable window is 7:00 AM to 11:00 AM in Seoul, which is 6:00 PM to 10:00 PM in Jacksonville.
both at work Seoul only Jacksonville only neither — hours shown along the strip are Seoul local time.
Convert a Specific Time
Pick any date and time in Seoul to see the exact equivalent in Jacksonville.
Common Times Converted
Seoul time on the left, Jacksonville time on the right.
Seoul to Jacksonville: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Seoul. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Seoul | Jacksonville | Working hours |
|---|---|---|
| 12:00 AM | 11:00 AM prev day | Jacksonville only |
| 1:00 AM | 12:00 PM prev day | Jacksonville only |
| 2:00 AM | 1:00 PM prev day | Jacksonville only |
| 3:00 AM | 2:00 PM prev day | Jacksonville only |
| 4:00 AM | 3:00 PM prev day | Jacksonville only |
| 5:00 AM | 4:00 PM prev day | Jacksonville only |
| 6:00 AM | 5:00 PM prev day | — |
| 7:00 AM | 6:00 PM prev day | — |
| 8:00 AM | 7:00 PM prev day | — |
| 9:00 AM | 8:00 PM prev day | Seoul only |
| 10:00 AM | 9:00 PM prev day | Seoul only |
| 11:00 AM | 10:00 PM prev day | Seoul only |
| 12:00 PM | 11:00 PM prev day | Seoul only |
| 1:00 PM | 12:00 AM | Seoul only |
| 2:00 PM | 1:00 AM | Seoul only |
| 3:00 PM | 2:00 AM | Seoul only |
| 4:00 PM | 3:00 AM | Seoul only |
| 5:00 PM | 4:00 AM | — |
| 6:00 PM | 5:00 AM | — |
| 7:00 PM | 6:00 AM | — |
| 8:00 PM | 7:00 AM | — |
| 9:00 PM | 8:00 AM | — |
| 10:00 PM | 9:00 AM | Jacksonville only |
| 11:00 PM | 10:00 AM | Jacksonville only |
Understanding the Seoul – Jacksonville Time Difference
Seoul runs on Asia/Seoul, currently KST (UTC+9:00). Jacksonville runs on America/New_York, currently EDT (UTC-4:00). The gap of 13 hours is simply the distance between those two offsets.
Jacksonville 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 Jacksonville 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.
Seoul today
Jacksonville today
Frequently Asked Questions
What is the time difference between Seoul and Jacksonville?
Jacksonville is currently 13 hours behind Seoul. That gap becomes 14 hours on Sunday, November 1, 2026, when Jacksonville changes its clocks.
How many hours behind is Jacksonville from Seoul?
Jacksonville is 13 hours behind Seoul. Looking at it the other way, Seoul is 13 hours ahead of Jacksonville.
What time is it in Jacksonville when it is 9:00 AM in Seoul?
When it is 9:00 AM in Seoul, it is 8:00 PM the previous day in Jacksonville.
Is Jacksonville ahead of or behind Seoul?
Jacksonville is 13 hours behind Seoul. Seoul reaches each point in the day first, so Jacksonville is still getting started while the Seoul working day is finishing.
What is the best time to call between Seoul and Jacksonville?
Standard business hours in Seoul and Jacksonville 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 11:00 AM in Seoul, which is 6:00 PM to 10:00 PM in Jacksonville.
Does the time difference between Seoul and Jacksonville change during the year?
Yes. Jacksonville 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 Seoul and Jacksonville in?
Seoul uses the Asia/Seoul time zone, currently KST (UTC+9:00). Jacksonville uses America/New_York, currently EDT (UTC-4:00).