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

5:30 PM — as of 3 October 2026. Colombo is 8 hours 30 minutes ahead of Buenos Aires.

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

There's no hour when both cities are in working hours (09:00–17:00). The fairest is around 07:00 in Buenos Aires (15:30 in Colombo).

What time zones are Buenos Aires and Colombo in?

Buenos Aires uses America/Argentina/Buenos_Aires (UTC−3 today); Colombo uses Asia/Colombo (UTC+5:30 today).

Time difference between Buenos Aires and Colombo

Colombo is 8 hours 30 minutes ahead of Buenos Aires. When it's 9:00 in Buenos Aires, it's 17:30 in Colombo.

From

Colombo is 8 hours 30 minutes ahead of Buenos Aires.

On Saturday, 3 October 2026, 09:00 in Buenos Aires is 17:30 in Colombo. Buenos Aires is UTC−3; Colombo is UTC+5:30.

The gap through 2026

It stays 8 hours 30 minutes all year — neither city changes its clocks against the other.

Buenos Aires to Colombo, hour by hour

On Monday 5 October.

Buenos Aires	Colombo
07:00 Early morning	15:30 Working hours
08:00 Early morning	16:30 Working hours
09:00 Working hours	17:30 Evening
10:00 Working hours	18:30 Evening
11:00 Working hours	19:30 Evening
12:00 Working hours	20:30 Evening
13:00 Working hours	21:30 Evening
14:00 Working hours	22:30 Sleeping hours
15:00 Working hours	23:30 Sleeping hours
16:00 Working hours	00:30+1 Sleeping hours
17:00 Evening	01:30+1 Sleeping hours
18:00 Evening	02:30+1 Sleeping hours
19:00 Evening	03:30+1 Sleeping hours
20:00 Evening	04:30+1 Sleeping hours
21:00 Evening	05:30+1 Sleeping hours
22:00 Sleeping hours	06:30+1 Sleeping hours

Daylight saving in 2026

Neither Buenos Aires nor Colombo 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 Colombo don't overlap, so any call is early or late for someone.

Buenos Aires 07:00Early morningColombo 15:30Working hours
Buenos Aires 09:00Working hoursColombo 17:30Evening
Buenos Aires 10:00Working hoursColombo 18:30Evening

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 Colombo when it's 9 AM in Buenos Aires?: 5:30 PM — as of 3 October 2026. Colombo is 8 hours 30 minutes ahead of Buenos Aires.
Does the time difference between Buenos Aires and Colombo change?: No. It's 8 hours 30 minutes all through 2026: neither city changes its clocks.
What's the best time for a call between Buenos Aires and Colombo?: There's no hour when both cities are in working hours (09:00–17:00). The fairest is around 07:00 in Buenos Aires (15:30 in Colombo).
What time zones are Buenos Aires and Colombo in?: Buenos Aires uses America/Argentina/Buenos_Aires (UTC−3 today); Colombo uses Asia/Colombo (UTC+5:30 today).

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