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Brazil has four time zones. It also observes summer time; however, not only do the starting and ending dates often change from year to year, it is also not followed by all states (which ones observe summer time can change from year to year).

Contents 1 Time zones 1.1 Brasília time 1.2 Brasília time + 1 1.3 Brasília time - 1 1.4 Brasília time - 2 2 Summer time 2.1 History 3 See also 4 References 5 External links

The main time zone of Brazil corresponds to the time at Brasília. All the other time zones are given as offsets to it. Outside of summer time, it corresponds to UTC-3; during summer time, it changes to UTC-2, but this change is not followed by all states. It comprises the Southeast Region, the South Region, the Northeast Region (except some islands), Goiás, Distrito Federal, Tocantins, the east side of Pará (including the city of Belém), and Amapá.

This time zone corresponds to UTC-2. It is used on a few islands on the east coast of Brazil (Fernando de Noronha, Trindade, Martin Vaz, Atol das Rocas, Saint Peter and Paul Rocks).

Outside of summer time, this time zone corresponds to UTC-4. It is used in the west side of Pará, most of Amazonas (all but the southwestern part, including the city of Manaus), Mato Grosso, Mato Grosso do Sul, Rondônia, and Roraima.

Outside of summer time, this time zone corresponds to UTC-5. It is used in the southwestern part of Amazonas, and in Acre.

There are no fixed start and end dates for summer time; they are decided every year by one or more decrees. The same decree(s) also say which states should or should not change their clocks. Sometimes these decrees are published very close to the start date, or even after it^[1].

In the states which follow summer time, the clock is moved forward by one hour between the start and end dates; the other states (or parts of states) do not change their clocks, which results on a change of the offset to Brasília time.

Summer time in Brazil was first adopted in 1931^[2]. Initially, it applied to the whole country (with an exception in part of 1963); since 1988, it started being used only in part of the country^[1].

• The zoneinfo database has detailed time zone information for Brazil
• List of time zones

1. ^ ^{a b} Decretos sobre o Horário de Verão no Brasil (Portuguese). Retrieved on January 23, 2007.
2. ^ HISTÓRICO DO HORÁRIO DE VERÃO (Portuguese). Retrieved on January 23, 2007.

• Divisão do Serviço da Hora do Observatório Nacional
  • Fusos Horários no BRASIL