1am in Seoul is 11pm in Hanoi on the previous day.

Frequently asked

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

What is the time difference between Seoul and Hanoi?

Seoul is 2 hours ahead of Hanoi right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.

When it's 1am in Seoul, what time is it in Hanoi?

1am in Seoul is 11pm in Hanoi on the previous day. It lands deep outside working hours in Hanoi — 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 Seoul and Hanoi?

11am–5pm in Seoul lines up with 9am–3pm in Hanoi — 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 — KST and +07:00 — 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.