1am in Greenwich Mean Time is 7am in Hanoi.

Frequently asked

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

What is the time difference between Greenwich Mean Time and Hanoi?

Greenwich Mean Time is 6 hours behind 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 Greenwich Mean Time, what time is it in Hanoi?

1am in Greenwich Mean Time is 7am in Hanoi. That's early morning in Hanoi, before the typical working day begins. Use the hour-by-hour table above to read any other time across.

What's the best time for a call between Greenwich Mean Time and Hanoi?

9am–11am in Greenwich Mean Time lines up with 3pm–5pm 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 — BST 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.