4am in Tokyo is 4am in Seoul.

Frequently asked

Quick answers about converting between Tokyo and Seoul. Can't find what you need? Email [email protected].

What is the time difference between Tokyo and Seoul?

Tokyo and Seoul are currently on the same time, so there is no difference to convert.

When it's 4am in Tokyo, what time is it in Seoul?

4am in Tokyo is 4am in Seoul. It lands deep outside working hours in Seoul — see the best time to meet below for a friendlier slot. Use the hour-by-hour table above to read any other time across.

What's the best time for a call between Tokyo and Seoul?

9am–5pm in Tokyo lines up with 9am–5pm in Seoul — both sides are inside a 9-to-5 working day.

Does this account for daylight saving time?

Yes. We track every clock change in both places, so the abbreviations you see — JST and KST — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.

Why is the date sometimes different on each side?

When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.