What is the time difference between Buenos Aires and Sydney?

Sydney is 13 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 Sydney 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 Sydney observe daylight saving time?

Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.

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

It is 01:00 in Sydney, and already the following day. 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 Sydney use?

Buenos Aires uses America/Argentina/Buenos_Aires, currently UTC-3, and Sydney uses Australia/Sydney, currently UTC+10 (AEST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Buenos Aires time to Sydney time

Sydney is 13 hours ahead of Buenos Aires right now, so midday in Buenos Aires lands in the small hours in Sydney.

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

Every hour of a day in Buenos Aires, and what the clock reads in Sydney at that same moment.

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

Daylight saving time

Sydney changes its clocks; Buenos Aires does not. The difference between them therefore shifts by an hour twice a year.

Buenos Aires

Does not observe daylight saving time

Standard: UTC-3

Sydney

Observes daylight saving time

Standard: UTC+10
Daylight: UTC+11
Next change: 2026-10-04 +60m

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 21:00–05:00Sydney 10:00–18:00
Buenos Aires 09:00–18:00Sydney 22:00–07:00

Reference

The zone identifiers and offsets behind everything above.

	Buenos Aires	Sydney
IANA zone	America/Argentina/Buenos_Aires	Australia/Sydney
Abbreviation	UTC-3	AEST
Standard offset	UTC-3	UTC+10
Daylight offset	—	UTC+11
Clock changes this year	0	2
Country	Argentina	Australia

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

Common questions

What is the time difference between Buenos Aires and Sydney?: Sydney is 13 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 Sydney 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 Sydney observe daylight saving time?: Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.
If it is midday in Buenos Aires, what time is it in Sydney?: It is 01:00 in Sydney, and already the following day. 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 Sydney use?: Buenos Aires uses America/Argentina/Buenos_Aires, currently UTC-3, and Sydney uses Australia/Sydney, currently UTC+10 (AEST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.