Convert Buenos Aires time to London time

Hour by hour

The whole day mapped across: read down the left for Buenos Aires, across for London.

Daylight saving time

Buenos Aires keeps one offset all year while London moves twice. That is the whole reason this difference is seasonal.

When you can actually talk

You have 5 hours of shared working time: 09:00–14:00 in Buenos Aires, which is 13:00–18:00 in London.

• Buenos Aires 09:00–14:00London 13:00–18:00

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Buenos Aires and London?

London is 4 hours ahead of Buenos Aires. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call London from Buenos Aires?

Between 09:00–14:00 in Buenos Aires, which is 13:00–18:00 in London. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Buenos Aires observe daylight saving time?

No. Buenos Aires stays on UTC-3 all year, so its clocks never move.

Does London observe daylight saving time?

Yes. London runs on UTC+0 in winter and UTC+1 in summer. The next change is on 2026-10-25, when clocks go back by 60 minutes.

If it is midday in Buenos Aires, what time is it in London?

It is 16:00 in London, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Buenos Aires and London use?

Buenos Aires uses America/Argentina/Buenos_Aires, currently UTC-3, and London uses Europe/London, currently UTC+1 (BST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.