Sao Paulo is in Brazil and is currently on UTC-3. Its time zone is America/Sao_Paulo.
Sao Paulo does not observe daylight saving time. It stays on UTC-3 all year, so the difference to any other place that also holds a fixed offset never changes.
The weekend in Sao Paulo falls on Saturday and Sunday. A working day of 9:00 AM to 6:00 PM is the assumption used on the board.
Sao Paulo shares America/Sao_Paulo with 2 other cities in the catalogue. They all read the same time and change their clocks together.
See the current time across Brazil, including the other cities Meridian tracks there and the time zones they use.