Brasília time

Time in Brazil is calculated using standard time, and the country (including its offshore islands) is divided into four standard time zones: UTC−02:00, UTC−03:00, UTC−04:00 and UTC−05:00.

Only part of the country observes daylight saving time, or "summer time" (Portuguese: horário de verão), as it is officially called. These areas are the Southern, Southeast and Central-Western Brazilian states.

This is the standard time zone only on a few small offshore Atlantic islands. The only such island with a permanent population is Fernando de Noronha, with 2,837 inhabitants (2013 estimate), 0.0014% of Brazil's population. The other islands (Trindade, Martim Vaz, Rocas Atoll and Saint Peter and Saint Paul Archipelago) either are totally uninhabited or have small seasonally rotating Brazilian Navy garrisons or teams of scientists.

This zone is at UTC−02:00 and it does not use daylight saving time.

The main time zone of Brazil corresponds to the time at the national capital city, Brasília. All the other time zones are given as offsets to it.

...
Wikipedia