Brazil uses three mainland time zones. Brasília Time (BRT, UTC−3) covers the most populous areas: São Paulo, Rio de Janeiro, Brasília, Salvador, Fortaleza, Recife, Manaus (Amazonas state capital), and most of the country. Amazonas Time (AMT, UTC−4) covers the state of Amazonas (outside the capital), Mato Grosso, Mato Grosso do Sul, Rondônia, and Roraima. Acre Time (ACT, UTC−5) covers the state of Acre and the far west of Amazonas.
Brazil abolished daylight saving time in April 2019. Before that, the southeastern states (including São Paulo) observed summer time annually. Since 2019, all Brazilian clocks stay fixed year-round — BRT is always UTC−3, AMT always UTC−4, ACT always UTC−5.
The Fernando de Noronha archipelago uses FNT (UTC−2), two hours behind Brasília.
Key gaps from Brasília (BRT): London (GMT) is 3 hours ahead in winter, 4 hours ahead during BST. New York (EST) is 2 hours ahead. Los Angeles (PST) is 5 hours ahead. Buenos Aires (ART, UTC−3) shares the same time. São Paulo to Manaus = 1 hour difference.