12am in London is 8pm in Buenos Aires on the previous day.

Frequently asked

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

What is the time difference between London and Buenos Aires?

London is 4 hours ahead of Buenos Aires 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 12am in London, what time is it in Buenos Aires?

12am in London is 8pm in Buenos Aires on the previous day. That's already evening in Buenos Aires, after the typical working day ends. Use the hour-by-hour table above to read any other time across.

What's the best time for a call between London and Buenos Aires?

1pm–5pm in London lines up with 9am–1pm in Buenos Aires — 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 -03:00 — 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.