Convert Buenos Aires time to Tokyo time

Hour by hour

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

Daylight saving time

Neither Buenos Aires nor Tokyo changes its clocks, so the difference between them is the same every day of the year.

When you can actually talk

There is no hour where both cities are inside a 09:00–18:00 working day. Someone has to move — the nearest workable windows are below.

• Buenos Aires 21:00–06:00Tokyo 09:00–18:00
• Buenos Aires 09:00–18:00Tokyo 21:00–06:00

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 Tokyo?

Tokyo is 12 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 Tokyo from Buenos Aires?

There is no time inside normal working hours in both cities, so someone has to take the call outside them. The nearest workable windows are listed above — pick one and alternate who gets the awkward slot.

Does Buenos Aires observe daylight saving time?

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

Does Tokyo observe daylight saving time?

No. Tokyo stays on UTC+9 all year, so its clocks never move.

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

It is 00:00 in Tokyo, and already the following day. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.

Which time zones do Buenos Aires and Tokyo use?

Buenos Aires uses America/Argentina/Buenos_Aires, currently UTC-3, and Tokyo uses Asia/Tokyo, currently UTC+9. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.