Buenos Aires vs São Paulo time

Does the time difference between Buenos Aires and São Paulo change?

It can. Many places move their clocks for daylight saving time, and countries don't all switch on the same dates — the US and Europe change a few weeks apart, and the Southern Hemisphere changes in the opposite season. The difference shown here is correct for today; use the time zone converter to check a future date.

Tips for calling or meeting between Buenos Aires and São Paulo

Look at the highlighted rows in the chart above — those are the hours when both cities are within a normal 9 AM–5 PM working day. When writing an invite, include both local times so nobody has to do the math.