Historically distinct IANA time zone
America/Cuiaba
Local time now
-04 · current offset
- Countries
- Brazil
- GPS reference
- 15.58° S, 56.08° W
- Data source
- IANA southamerica
- Aliases
- None
- Rule groups
- Brazil
BrazilMato Grosso
Geographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 15.58° S, 56.08° W. Associated countries: BR.
The Wikipedia link provides additional context; it is not evidence for a historical claim. Transition data comes from the IANA source file.
Notes from the time database
The story behind the clock
These source notes describe a period or rule. They do not, by themselves, establish a causal claim for a particular clock change.
Decree 20,466 < (1931-10-01) Decree 21,896 < (1932-01-10)
Original IANA source file: southamerica.
A shared present
Same clock today, different past
These nearby zones follow the same current annual pattern, yet retain their own historical record.
Bolivia · 1293 km from the reference location · Same annual clock since 2020Civil-time record
Recorded changes over time
From 1913 to 2019 · 89 recorded transitions
Recurring daylight-saving changes are grouped separately when JavaScript is available.
Notable changes
One-off changes and transitions outside the recurring seasonal rhythm.
- -04:00 · -04Standard time applies
- -03:00 · -03Daylight saving time begins
- -04:00 · -04Standard time applies
- -03:00 · -03Daylight saving time begins
- -04:00 · -04Standard time applies
- -03:00 · -03Daylight saving time begins
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1913-12-31 23:44 | -04:00 | -04 | Standard time |
| 1931-10-03 12:00 | -03:00 | -03 | Daylight saving time |
| 1932-03-31 23:00 | -04:00 | -04 | Standard time |
| 1932-10-03 01:00 | -03:00 | -03 | Daylight saving time |
| 1933-03-31 23:00 | -04:00 | -04 | Standard time |
| 1949-12-01 01:00 | -03:00 | -03 | Daylight saving time |
| 1950-04-16 00:00 | -04:00 | -04 | Standard time |
| 1950-12-01 01:00 | -03:00 | -03 | Daylight saving time |
| 1951-03-31 23:00 | -04:00 | -04 | Standard time |
| 1951-12-01 01:00 | -03:00 | -03 | Daylight saving time |
| 1952-03-31 23:00 | -04:00 | -04 | Standard time |
| 1952-12-01 01:00 | -03:00 | -03 | Daylight saving time |
| 1953-02-28 23:00 | -04:00 | -04 | Standard time |
| 1963-12-09 01:00 | -03:00 | -03 | Daylight saving time |
| 1964-02-29 23:00 | -04:00 | -04 | Standard time |
| 1965-01-31 01:00 | -03:00 | -03 | Daylight saving time |
| 1965-03-30 23:00 | -04:00 | -04 | Standard time |
| 1965-12-01 01:00 | -03:00 | -03 | Daylight saving time |
| 1966-02-28 23:00 | -04:00 | -04 | Standard time |
| 1966-11-01 01:00 | -03:00 | -03 | Daylight saving time |
| 1967-02-28 23:00 | -04:00 | -04 | Standard time |
| 1967-11-01 01:00 | -03:00 | -03 | Daylight saving time |
| 1968-02-29 23:00 | -04:00 | -04 | Standard time |
| 1985-11-02 01:00 | -03:00 | -03 | Daylight saving time |
| 1986-03-14 23:00 | -04:00 | -04 | Standard time |
| 1986-10-25 01:00 | -03:00 | -03 | Daylight saving time |
| 1987-02-13 23:00 | -04:00 | -04 | Standard time |
| 1987-10-25 01:00 | -03:00 | -03 | Daylight saving time |
| 1988-02-06 23:00 | -04:00 | -04 | Standard time |
| 1988-10-16 01:00 | -03:00 | -03 | Daylight saving time |
| 1989-01-28 23:00 | -04:00 | -04 | Standard time |
| 1989-10-15 01:00 | -03:00 | -03 | Daylight saving time |
| 1990-02-10 23:00 | -04:00 | -04 | Standard time |
| 1990-10-21 01:00 | -03:00 | -03 | Daylight saving time |
| 1991-02-16 23:00 | -04:00 | -04 | Standard time |
| 1991-10-20 01:00 | -03:00 | -03 | Daylight saving time |
| 1992-02-08 23:00 | -04:00 | -04 | Standard time |
| 1992-10-25 01:00 | -03:00 | -03 | Daylight saving time |
| 1993-01-30 23:00 | -04:00 | -04 | Standard time |
| 1993-10-17 01:00 | -03:00 | -03 | Daylight saving time |
| 1994-02-19 23:00 | -04:00 | -04 | Standard time |
| 1994-10-16 01:00 | -03:00 | -03 | Daylight saving time |
| 1995-02-18 23:00 | -04:00 | -04 | Standard time |
| 1995-10-15 01:00 | -03:00 | -03 | Daylight saving time |
| 1996-02-10 23:00 | -04:00 | -04 | Standard time |
| 1996-10-06 01:00 | -03:00 | -03 | Daylight saving time |
| 1997-02-15 23:00 | -04:00 | -04 | Standard time |
| 1997-10-06 01:00 | -03:00 | -03 | Daylight saving time |
| 1998-02-28 23:00 | -04:00 | -04 | Standard time |
| 1998-10-11 01:00 | -03:00 | -03 | Daylight saving time |
| 1999-02-20 23:00 | -04:00 | -04 | Standard time |
| 1999-10-03 01:00 | -03:00 | -03 | Daylight saving time |
| 2000-02-26 23:00 | -04:00 | -04 | Standard time |
| 2000-10-08 01:00 | -03:00 | -03 | Daylight saving time |
| 2001-02-17 23:00 | -04:00 | -04 | Standard time |
| 2001-10-14 01:00 | -03:00 | -03 | Daylight saving time |
| 2002-02-16 23:00 | -04:00 | -04 | Standard time |
| 2002-11-03 01:00 | -03:00 | -03 | Daylight saving time |
| 2003-02-15 23:00 | -04:00 | -04 | Standard time |
| 2004-11-02 01:00 | -03:00 | -03 | Daylight saving time |
| 2005-02-19 23:00 | -04:00 | -04 | Standard time |
| 2005-10-16 01:00 | -03:00 | -03 | Daylight saving time |
| 2006-02-18 23:00 | -04:00 | -04 | Standard time |
| 2006-11-05 01:00 | -03:00 | -03 | Daylight saving time |
| 2007-02-24 23:00 | -04:00 | -04 | Standard time |
| 2007-10-14 01:00 | -03:00 | -03 | Daylight saving time |
| 2008-02-16 23:00 | -04:00 | -04 | Standard time |
| 2008-10-19 01:00 | -03:00 | -03 | Daylight saving time |
| 2009-02-14 23:00 | -04:00 | -04 | Standard time |
| 2009-10-18 01:00 | -03:00 | -03 | Daylight saving time |
| 2010-02-20 23:00 | -04:00 | -04 | Standard time |
| 2010-10-17 01:00 | -03:00 | -03 | Daylight saving time |
| 2011-02-19 23:00 | -04:00 | -04 | Standard time |
| 2011-10-16 01:00 | -03:00 | -03 | Daylight saving time |
| 2012-02-25 23:00 | -04:00 | -04 | Standard time |
| 2012-10-21 01:00 | -03:00 | -03 | Daylight saving time |
| 2013-02-16 23:00 | -04:00 | -04 | Standard time |
| 2013-10-20 01:00 | -03:00 | -03 | Daylight saving time |
| 2014-02-15 23:00 | -04:00 | -04 | Standard time |
| 2014-10-19 01:00 | -03:00 | -03 | Daylight saving time |
| 2015-02-21 23:00 | -04:00 | -04 | Standard time |
| 2015-10-18 01:00 | -03:00 | -03 | Daylight saving time |
| 2016-02-20 23:00 | -04:00 | -04 | Standard time |
| 2016-10-16 01:00 | -03:00 | -03 | Daylight saving time |
| 2017-02-18 23:00 | -04:00 | -04 | Standard time |
| 2017-10-15 01:00 | -03:00 | -03 | Daylight saving time |
| 2018-02-17 23:00 | -04:00 | -04 | Standard time |
| 2018-11-04 01:00 | -03:00 | -03 | Daylight saving time |
| 2019-02-16 23:00 | -04:00 | -04 | Standard time |