Home > Time Zones > Abbreviations > AMST – Amazon Summer Time

AMST – Amazon Summer Time (Daylight Saving Time)

Amazon Summer Time Note:

South America: AMST is not observed in any location this year. Locations that used to be on AMST for part or all of the year are now on AMT instead.

Time zone map of AMST
No locations currently on AMST.
Observes AMST part of the year.
Areas with same time currently (UTC -3:00).
No locations are currently on AMST – Amazon Summer Time.
Observes AMST – Amazon Summer Time part of the year, but not currently.
Currently has same time zone offset as AMST (UTC -3:00) but different time zone name.

Amazon Summer Time (AMST) is 3 hours behind Coordinated Universal Time (UTC). This time zone is a DST (daylight saving time) time zone and is used in: South America.

See full time zone map

Winter Time & DST

This time zone is a daylight saving/summer time zone, in the winter some places will switch to the corresponding standard time zone: AMT (Amazon Time).

Email time zone indicator: -0300

An email sent from someone in the Amazon Summer Time (AMST) time zone will have the time zone listed as "-0300" in the headers of the email. (However, "-0300" does not have to be in Amazon Summer Time, as other time zones could have the same UTC offset).

Where and when is AMST observed?

South America

Brazilian states using AMST in the summer and AMT in the winter

  • Mato Grosso (some exceptions, but including Cuiabá) Show

    Exceptions: Água Boa, Alto da Boa Vista, Alto Araguaia, Alto Taquari, Araguaiana, Araguainha, Barra do Garças, Bom Jesus do Araguaia, Campinápolis, Canabrava do Norte, Canarana, Cocalinho, Confresa, General Carneiro, Luciara, Nova Nazaré, Nova Xavantina, N

  • Mato Grosso Do Sul (includes Campo Grande)

Other time zones in UTC -3:00

Some time zones exist that have the same offset as AMST, but can be found under a different name:

No locations currently on AMST

  • AMST will be observed in Cuiabá starting from Oct 18, 2015 at 12:00 AM
  • UTC Offset: UTC -3:00

Find current time and time zone by city


Other time zones named AMST

AMST – Armenia Summer Time

Example cities

Brazil – Cuiabá (Summer)

Related time zones

AMT – Amazon Time (Standard Time)

Time Zone Map with DST

Time zone map

Time Zone Map