What time is it in Tokyo when it's 9 AM in Buenos Aires?

9:00 PM — as of 5 October 2026. Tokyo is 12 hours ahead of Buenos Aires.

Does the time difference between Buenos Aires and Tokyo change?

No. It's 12 hours all through 2026: neither city changes its clocks.

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

There's no hour when both cities are in working hours (09:00–17:00). The fairest is around 07:00 in Buenos Aires (19:00 in Tokyo).

What time zones are Buenos Aires and Tokyo in?

Buenos Aires uses America/Argentina/Buenos_Aires (UTC−3 today); Tokyo uses Asia/Tokyo (UTC+9 today).

Time difference between Buenos Aires and Tokyo

Tokyo is 12 hours ahead of Buenos Aires. When it's 9:00 in Buenos Aires, it's 21:00 in Tokyo.

From

Tokyo is 12 hours ahead of Buenos Aires.

On Monday, 5 October 2026, 09:00 in Buenos Aires is 21:00 in Tokyo. Buenos Aires is UTC−3; Tokyo is UTC+9.

The gap through 2026

It stays 12 hours all year — neither city changes its clocks against the other.

Buenos Aires to Tokyo, hour by hour

On Monday 5 October.

Buenos Aires	Tokyo
07:00 Early morning	19:00 Evening
08:00 Early morning	20:00 Evening
09:00 Working hours	21:00 Evening
10:00 Working hours	22:00 Sleeping hours
11:00 Working hours	23:00 Sleeping hours
12:00 Working hours	00:00+1 Sleeping hours
13:00 Working hours	01:00+1 Sleeping hours
14:00 Working hours	02:00+1 Sleeping hours
15:00 Working hours	03:00+1 Sleeping hours
16:00 Working hours	04:00+1 Sleeping hours
17:00 Evening	05:00+1 Sleeping hours
18:00 Evening	06:00+1 Sleeping hours
19:00 Evening	07:00+1 Early morning
20:00 Evening	08:00+1 Early morning
21:00 Evening	09:00+1 Working hours
22:00 Sleeping hours	10:00+1 Working hours

Daylight saving in 2026

Neither Buenos Aires nor Tokyo changes its clocks, so the difference is the same all year.

Best times for a call

Working hours (09:00–17:00) in Buenos Aires and Tokyo don't overlap, so any call is early or late for someone.

Buenos Aires 07:00Early morningTokyo 19:00Evening
Buenos Aires 09:00Working hoursTokyo 21:00Evening
Buenos Aires 21:00EveningTokyo 09:00 +1Working hours

How the time difference calculator works

The difference is each city's offset from UTC on the date you pick, subtracted. Offsets come from the IANA time zone database in your browser.

Because countries change their clocks on different dates — or not at all — the gap between two cities can change for a few weeks a year. The calculator lists every change in the year.

Examples

London is 5 hours ahead of New York for most of the year, but only 4 hours ahead for about three weeks in March and one week in late October.
Dubai doesn't change its clocks, so its gap to London is 4 hours in winter and 3 hours in summer.

Good for

Knowing when a colleague's day starts
Setting expectations for replies across time zones
Planning travel and jet lag

Frequently asked questions

What time is it in Tokyo when it's 9 AM in Buenos Aires?: 9:00 PM — as of 5 October 2026. Tokyo is 12 hours ahead of Buenos Aires.
Does the time difference between Buenos Aires and Tokyo change?: No. It's 12 hours all through 2026: neither city changes its clocks.
What's the best time for a call between Buenos Aires and Tokyo?: There's no hour when both cities are in working hours (09:00–17:00). The fairest is around 07:00 in Buenos Aires (19:00 in Tokyo).
What time zones are Buenos Aires and Tokyo in?: Buenos Aires uses America/Argentina/Buenos_Aires (UTC−3 today); Tokyo uses Asia/Tokyo (UTC+9 today).

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