Brazil is a continental country, covering four official time zones. Due to its extent from east to west, the time varies according to longitude, but all time zones follow a system standardized by the Decree No. 4,901/2003.
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1. Official Time Zones
| Time Zone | UTC | Main States/Regions |
|---|---|---|
| UTC−02 | +2 hours relative to UTC | Fernando de Noronha, Trindade, Martim Vaz |
| UTC−03 | +3 hours | Most of Brazil: Brasília, São Paulo, Rio de Janeiro, Minas Gerais, Bahia |
| UTC−04 | +4 hours | Mato Grosso, Mato Grosso do Sul, Rondônia, Roraima, Amazonas (except for the western part) |
| UTC−05 | +5 hours | Acre and part of the extreme west of Amazonas |
Note: Before 2008, there was also UTC−04:30 for the state of Acre, but the time was unified for simplification.
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2. How Time Zones Work
- Each time zone represents approximately 15° of longitude, corresponding to a 1-hour difference.
- O The reference meridian is Greenwich Mean Time (GMT/UTC 0).
- As you move west, the times lag; as you move east, they advance.
- The time zone of each state is defined considering average longitude and administrative decisions, not always following perfect geographical lines.
3. Interesting Facts
- Fernando de Noronha has the most advanced time zone: UTC−02, even though it is geographically to the east, which allows for better use of daylight.
- Acre and the southwest of Amazonas have the most delayed time zone: UTC−05.
- Daylight saving time was abolished in 2019 in Brazil, so the time zones no longer undergo seasonal changes.
- They are not perfect time zones: Some cities cut through the official geographical time zone for political or administrative reasons.
- Extreme time difference: Between Fernando de Noronha (UTC−02) and Acre (UTC−05), there is a difference of 3 hours — while it is 12 PM in Recife, it is still 9 AM in Rio Branco.