America/Montevideo

Time zone identifier: America/Montevideo

Current civil offset: -03:00 (-03)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1908-06-10

Local Mean Time (LMT): -03:44:51 based on geographic meridian

Total recorded transitions: 86 transitions across 7 distinct offsets

Associated countries: UY

Historical Offset Step Chart (1880 to Present)

Text summary: America/Montevideo shifted between 7 distinct offsets from 1908-06-10 through the modern era.

Complete Transition History (86 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1908-06-10T03:44:51Z`	`1908-06-10 00:00:00`	-03:44:51 → -03:44:51	`MMT`	No	offset-only
`1920-05-01T03:44:51Z`	`1920-04-30 23:44:51`	-03:44:51 → -04:00	`-04`	No	overlap
`1923-10-01T04:00:00Z`	`1923-10-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1924-04-01T03:00:00Z`	`1924-03-31 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1924-10-01T03:30:00Z`	`1924-10-01 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1925-04-01T03:00:00Z`	`1925-03-31 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1925-10-01T03:30:00Z`	`1925-10-01 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1926-04-01T03:00:00Z`	`1926-03-31 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1933-10-29T03:30:00Z`	`1933-10-29 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1934-04-01T03:00:00Z`	`1934-03-31 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1934-10-28T03:30:00Z`	`1934-10-28 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1935-03-31T03:00:00Z`	`1935-03-30 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1935-10-27T03:30:00Z`	`1935-10-27 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1936-03-29T03:00:00Z`	`1936-03-28 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1936-10-25T03:30:00Z`	`1936-10-25 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1937-03-28T03:00:00Z`	`1937-03-27 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1937-10-31T03:30:00Z`	`1937-10-31 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1938-03-27T03:00:00Z`	`1938-03-26 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1938-10-30T03:30:00Z`	`1938-10-30 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1939-03-26T03:00:00Z`	`1939-03-25 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1939-10-01T03:30:00Z`	`1939-10-01 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1940-03-31T03:00:00Z`	`1940-03-30 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1940-10-27T03:30:00Z`	`1940-10-27 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1941-03-30T03:00:00Z`	`1941-03-29 23:30:00`	-03:00 → -03:30	`-0330`	No	overlap
`1941-08-01T03:30:00Z`	`1941-08-01 00:30:00`	-03:30 → -03:00	`-03`	Yes	gap
`1942-12-14T03:00:00Z`	`1942-12-14 00:30:00`	-03:00 → -02:30	`-0230`	Yes	gap
`1943-03-14T02:30:00Z`	`1943-03-13 23:30:00`	-02:30 → -03:00	`-03`	No	overlap
`1959-05-24T03:00:00Z`	`1959-05-24 00:30:00`	-03:00 → -02:30	`-0230`	Yes	gap
`1959-11-15T02:30:00Z`	`1959-11-14 23:30:00`	-02:30 → -03:00	`-03`	No	overlap
`1960-01-17T03:00:00Z`	`1960-01-17 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1960-03-06T02:00:00Z`	`1960-03-05 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1965-04-04T03:00:00Z`	`1965-04-04 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1965-09-26T02:00:00Z`	`1965-09-25 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1968-05-27T03:00:00Z`	`1968-05-27 00:30:00`	-03:00 → -02:30	`-0230`	Yes	gap
`1968-12-01T02:30:00Z`	`1968-11-30 23:30:00`	-02:30 → -03:00	`-03`	No	overlap
`1970-04-25T03:00:00Z`	`1970-04-25 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1970-06-14T02:00:00Z`	`1970-06-13 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1972-04-23T03:00:00Z`	`1972-04-23 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1972-07-16T02:00:00Z`	`1972-07-15 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1974-01-13T03:00:00Z`	`1974-01-13 01:30:00`	-03:00 → -01:30	`-0130`	Yes	gap
`1974-03-10T01:30:00Z`	`1974-03-09 23:00:00`	-01:30 → -02:30	`-0230`	Yes	overlap
`1974-09-01T02:30:00Z`	`1974-08-31 23:30:00`	-02:30 → -03:00	`-03`	No	overlap
`1974-12-22T03:00:00Z`	`1974-12-22 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1975-03-30T02:00:00Z`	`1975-03-29 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1976-12-19T03:00:00Z`	`1976-12-19 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1977-03-06T02:00:00Z`	`1977-03-05 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1977-12-04T03:00:00Z`	`1977-12-04 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1978-03-05T02:00:00Z`	`1978-03-04 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1978-12-17T03:00:00Z`	`1978-12-17 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1979-03-04T02:00:00Z`	`1979-03-03 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1979-04-29T03:00:00Z`	`1979-04-29 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1980-03-16T02:00:00Z`	`1980-03-15 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1987-12-14T03:00:00Z`	`1987-12-14 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1988-02-28T02:00:00Z`	`1988-02-27 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1988-12-11T03:00:00Z`	`1988-12-11 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1989-03-05T02:00:00Z`	`1989-03-04 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1989-10-29T03:00:00Z`	`1989-10-29 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1990-02-25T02:00:00Z`	`1990-02-24 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1990-10-21T03:00:00Z`	`1990-10-21 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1991-03-03T02:00:00Z`	`1991-03-02 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1991-10-27T03:00:00Z`	`1991-10-27 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1992-03-01T02:00:00Z`	`1992-02-29 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1992-10-18T03:00:00Z`	`1992-10-18 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1993-02-28T02:00:00Z`	`1993-02-27 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2004-09-19T03:00:00Z`	`2004-09-19 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2005-03-27T04:00:00Z`	`2005-03-27 01:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2005-10-09T05:00:00Z`	`2005-10-09 03:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2006-03-12T04:00:00Z`	`2006-03-12 01:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2006-10-01T05:00:00Z`	`2006-10-01 03:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2007-03-11T04:00:00Z`	`2007-03-11 01:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2007-10-07T05:00:00Z`	`2007-10-07 03:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2008-03-09T04:00:00Z`	`2008-03-09 01:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2008-10-05T05:00:00Z`	`2008-10-05 03:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2009-03-08T04:00:00Z`	`2009-03-08 01:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2009-10-04T05:00:00Z`	`2009-10-04 03:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2010-03-14T04:00:00Z`	`2010-03-14 01:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2010-10-03T05:00:00Z`	`2010-10-03 03:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2011-03-13T04:00:00Z`	`2011-03-13 01:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2011-10-02T05:00:00Z`	`2011-10-02 03:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2012-03-11T04:00:00Z`	`2012-03-11 01:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2012-10-07T05:00:00Z`	`2012-10-07 03:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2013-03-10T04:00:00Z`	`2013-03-10 01:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2013-10-06T05:00:00Z`	`2013-10-06 03:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2014-03-09T04:00:00Z`	`2014-03-09 01:00:00`	-02:00 → -03:00	`-03`	No	overlap
`2014-10-05T05:00:00Z`	`2014-10-05 03:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2015-03-08T04:00:00Z`	`2015-03-08 01:00:00`	-02:00 → -03:00	`-03`	No	overlap

Notes from the Maintainers

Source: southamerica (Lines 2037 to 2049)

From Steffen Thorsen (2015-06-30):
... it looks like they will not be using DST the coming summer:
http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787
http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/
From Paul Eggert (2015-06-30):
Apparently restaurateurs complained that DST caused people to go to the beach
instead of out to dinner.
From Pablo Camargo (2015-07-13):
http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf
From Tim Parenti (2018-02-15):
Decreto 178/015 of 2015-06-29; repeals Decreto 311/006.

This Zone can be simplified once we assume zic %z.

Attributed Statements:

Steffen Thorsen (2015-06-30):

... it looks like they will not be using DST the coming summer: http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787 http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/

Paul Eggert (2015-06-30):

Apparently restaurateurs complained that DST caused people to go to the beach instead of out to dinner.

Pablo Camargo (2015-07-13):

http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf

Tim Parenti (2018-02-15):

Decreto 178/015 of 2015-06-29; repeals Decreto 311/006. This Zone can be simplified once we assume zic %z.

Years on Record

Methodology Note: The 1970 Rule

tzdb guarantees accuracy for timestamps from 1970 onwards. Transitions prior to 1970 represent best-effort historical reconstructions.