Multiple Global Meanings for AMT
The abbreviation AMT has multiple official meanings across different continents and legal jurisdictions. Below are all recognized global definitions:
Region: Brazilian States of Amazonas, Rondônia, Roraima, Mato Grosso, Mato Grosso do Sul
Daylight Saving: No daylight saving shift
Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Amazon Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
None (Brazil abolished seasonal daylight saving time nationwide in 2019)
⬇️ Fall Back (Clocks Return)
None
Observing Jurisdictions & Subdivisions
2 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under AMT:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
The Free Economic Zone of Manaus operates major electronics and motorcycle assembly plants trading with São Paulo and international partners.
Local Hours: 08:00 - 17:00 AMT
UTC Window: 12:00 - 21:00 UTC
Major Cities in AMT
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1913
Established under Brazilian Federal Decree No. 2,784 on June 18, 1913, Amazon Time standardized western Brazil on UTC-4, one hour behind the national capital standard (BRT, UTC-3).
AMT is also the official acronym for Armenia Time (UTC+4) in the Caucasus, making the abbreviation chronometrically ambiguous with opposite hemisphere offsets.
Frequently Asked Questions about AMT
What is Amazon Time?
Amazon Time (AMT) is UTC-4, observed in western and central Brazilian states across the Amazon basin.
What is the time difference between Manaus and São Paulo?
Manaus (AMT, UTC-4) is 1 hour behind São Paulo and Brasília (BRT, UTC-3).
Is AMT ambiguous?
Yes. AMT stands for Amazon Time (UTC-4) in Brazil and Armenia Time (UTC+4) in the South Caucasus.