What is the time difference between Tokyo and Buenos Aires?

Buenos Aires is 12 hours behind Tokyo. 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 Buenos Aires from Tokyo?

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 Tokyo observe daylight saving time?

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

Does Buenos Aires observe daylight saving time?

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

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

It is 00:00 in Buenos Aires, on the same calendar date. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.

Which time zones do Tokyo and Buenos Aires use?

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

Convert Tokyo time to Buenos Aires time

Right now Buenos Aires runs 12 hours behind Tokyo. That gap is not fixed: it moves when either city changes its clocks.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

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

Tokyo	Buenos Aires
00:00	12:00previous day
01:00	13:00previous day
02:00	14:00previous day
03:00	15:00previous day
04:00	16:00previous day
05:00	17:00previous day
06:00	18:00previous day
07:00	19:00previous day
08:00	20:00previous day
09:00	21:00previous day
10:00	22:00previous day
11:00	23:00previous day
12:00	00:00
13:00	01:00
14:00	02:00
15:00	03:00
16:00	04:00
17:00	05:00
18:00	06:00
19:00	07:00
20:00	08:00
21:00	09:00
22:00	10:00
23:00	11:00

Daylight saving time

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

Tokyo

Does not observe daylight saving time

Standard: UTC+9

Buenos Aires

Does not observe daylight saving time

Standard: UTC-3

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.

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

Reference

The zone identifiers and offsets behind everything above.

	Tokyo	Buenos Aires
IANA zone	Asia/Tokyo	America/Argentina/Buenos_Aires
Abbreviation	UTC+9	UTC-3
Standard offset	UTC+9	UTC-3
Daylight offset	—	—
Clock changes this year	0	0
Country	Japan	Argentina

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

Common questions

What is the time difference between Tokyo and Buenos Aires?: Buenos Aires is 12 hours behind Tokyo. 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 Buenos Aires from Tokyo?: 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 Tokyo observe daylight saving time?: No. Tokyo stays on UTC+9 all year, so its clocks never move.
Does Buenos Aires observe daylight saving time?: No. Buenos Aires stays on UTC-3 all year, so its clocks never move.
If it is midday in Tokyo, what time is it in Buenos Aires?: It is 00:00 in Buenos Aires, on the same calendar date. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.
Which time zones do Tokyo and Buenos Aires use?: Tokyo uses Asia/Tokyo, currently UTC+9, and Buenos Aires uses America/Argentina/Buenos_Aires, currently UTC-3. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.