Argentina time zone: what time is it in Buenos Aires right now?

Argentina is a frequent destination for travelers and has strong commercial ties with Brazil and beyond. Before booking a meeting in Buenos Aires, Córdoba, or Mendoza, it helps to understand Argentina's timezone — which has one important quirk.

What time zone does Argentina use?

All of Argentina operates on ART — Argentina Time, UTC-3 — year-round. There are no internal subdivisions (unlike Brazil, which has four zones).

This means that from La Quiaca in the far north to Ushuaia in Patagonia, all of Argentina shares the same clock.

Does Argentina observe daylight saving time?

No. Argentina dropped DST in 2009 after a turbulent experiment between 2007 and 2009. Since then the country has stayed at UTC-3 all year.

This makes coordination between Argentina and other UTC-3 countries — including Brazil's main population centers — extremely simple.

Time difference between Argentina and Brazil

Because Brasília and Buenos Aires share the same offset (UTC-3), the difference is zero year-round:

• Brasília × Buenos Aires: 0 hours (same clock always)
• São Paulo × Mendoza: 0 hours
• Rio de Janeiro × Córdoba: 0 hours
• Manaus × Buenos Aires: Buenos Aires is 1 hour ahead (Manaus is UTC-4)
• Rio Branco × Buenos Aires: Buenos Aires is 2 hours ahead (Acre is UTC-5)
• Fernando de Noronha × Buenos Aires: Buenos Aires is 1 hour behind (Noronha is UTC-2)

When was there a difference between Brazil and Argentina?

Between 2008 and 2019, when Brazil still observed DST from October to February, southern, southeastern, and central-western Brazilian cities were 1 hour ahead of Buenos Aires during austral summer. That gap no longer exists.

Argentine business hours

Office hours in Buenos Aires typically run from 9am to 6pm with a midday break between 1pm and 2pm. Because Argentina shares Brazil's main offset, scheduling with Argentine companies works exactly like scheduling within Brazil.

Other major Argentine cities

Despite the country's size, every city follows the same UTC-3 offset:

• Buenos Aires — capital, ART zone
• Córdoba — second largest city, same zone
• Rosario — third major hub
• Mendoza — base for trips to the Andes
• Bariloche — Patagonian Argentina, same zone
• Ushuaia — southernmost city in the world, still UTC-3

How to check the time in Buenos Aires right now

Open the Buenos Aires page on QueHoras to see the live clock, sunrise and sunset, and the timezone label. Because Brazil and Argentina share UTC-3, the clock will match Brazilian local time — a practical confirmation that the two sides are perfectly in sync.