America/Montevideo time zone
11:00AMUTC−3
UTC−3UTC−3+2 h vs New York (you)
No transitions: America/Montevideo stays on UTC−3.
About America/Montevideo
America/Montevideo is the IANA time zone for Uruguay. It currently keeps UTC−3 all year.
Its principal location is Montevideo at 34.91° S, 56.21° W.
Rule for future years (POSIX TZ string)
<-03>3
The standard time is called “-03” (a numeric abbreviation) and is UTC−3. POSIX writes the offset with the opposite sign (west of Greenwich is positive), which is why the string says "3". There is no daylight saving rule: the zone stays on this offset for every year after the end of its explicit transitions. Software that has no full tzdata copy, such as many embedded devices, can use this string directly as the TZ environment variable.
History of America/Montevideo since 1970
The record starts with local mean time (UTC−3:45), which ended on June 9, 1908. The first daylight saving time in the record is in 1923.
| Years | Clocks | Abbreviations |
|---|---|---|
| 1970 | mostly UTC−3; also UTC−2 for part of the year | — |
| 1971 | UTC−3 all year | — |
| 1972 | UTC−2 in winter, UTC−3 in summer | — |
| 1973 | UTC−3 all year | — |
| 1974 | UTC−2:30 in winter, UTC−1:30 in summer; also UTC−3, UTC−2 for part of the year | — |
| 1975 | UTC−2 until March 30, then UTC−3 | — |
| 1976 | UTC−3 until December 19, then UTC−2 | — |
| 1977–1978 | UTC−3 in winter, UTC−2 in summer | — |
| 1979 | mostly UTC−2; also UTC−3 for part of the year | — |
| 1980 | UTC−2 until March 16, then UTC−3 | — |
| 1981–1986 | UTC−3 all year | — |
| 1987 | UTC−3 until December 14, then UTC−2 | — |
| 1988–1992 | UTC−3 in winter, UTC−2 in summer | — |
| 1993 | UTC−2 until February 28, then UTC−3 | — |
| 1994–2003 | UTC−3 all year | — |
| 2004 | UTC−3 until September 19, then UTC−2 | — |
| 2005–2014 | UTC−3 in winter, UTC−2 in summer | — |
| 2015 | UTC−2 until March 8, then UTC−3 | — |
| 2016 onward | UTC−3 all year | — |
Before 1970
34 offset changes before 1970 in the record; the first 12 and the last 12:
- Friday, April 30, 1920: UTC−3:45 → UTC−4
- Monday, October 1, 1923: UTC−4 → UTC−3, daylight saving time
- Tuesday, April 1, 1924: UTC−3 → UTC−3:30
- Wednesday, October 1, 1924: UTC−3:30 → UTC−3, daylight saving time
- Wednesday, April 1, 1925: UTC−3 → UTC−3:30
- Thursday, October 1, 1925: UTC−3:30 → UTC−3, daylight saving time
- Thursday, April 1, 1926: UTC−3 → UTC−3:30
- Sunday, October 29, 1933: UTC−3:30 → UTC−3, daylight saving time
- Sunday, April 1, 1934: UTC−3 → UTC−3:30
- Sunday, October 28, 1934: UTC−3:30 → UTC−3, daylight saving time
- Sunday, March 31, 1935: UTC−3 → UTC−3:30
- Sunday, October 27, 1935: UTC−3:30 → UTC−3, daylight saving time
- Sunday, March 30, 1941: UTC−3 → UTC−3:30
- Friday, August 1, 1941: UTC−3:30 → UTC−3, daylight saving time
- Monday, December 14, 1942: UTC−3 → UTC−2:30, daylight saving time
- Sunday, March 14, 1943: UTC−2:30 → UTC−3
- Sunday, May 24, 1959: UTC−3 → UTC−2:30, daylight saving time
- Sunday, November 15, 1959: UTC−2:30 → UTC−3
- Sunday, January 17, 1960: UTC−3 → UTC−2, daylight saving time
- Sunday, March 6, 1960: UTC−2 → UTC−3
- Sunday, April 4, 1965: UTC−3 → UTC−2, daylight saving time
- Sunday, September 26, 1965: UTC−2 → UTC−3
- Monday, May 27, 1968: UTC−3 → UTC−2:30, daylight saving time
- Sunday, December 1, 1968: UTC−2:30 → UTC−3
tzdata commits to accuracy from 1970 for every zone (zone1970.tab); earlier entries are historical research and may be incomplete.
Aliases and zones with the same clock
Other zones that keep exactly the same time under the current rules (but have a different history): America/Araguaina, America/Argentina/Buenos_Aires, America/Argentina/Catamarca, America/Argentina/Cordoba, America/Argentina/Jujuy, America/Argentina/La_Rioja, America/Argentina/Mendoza, America/Argentina/Rio_Gallegos, America/Argentina/Salta, America/Argentina/San_Juan, America/Argentina/San_Luis, America/Argentina/Tucuman.
Places on America/Montevideo
Convert Montevideo time
Using America/Montevideo in code
Every major platform reads the same IANA ID. Store instants in UTC and convert with the ID at display time; never store a fixed offset for a place that has daylight saving time.
// JavaScript
new Date().toLocaleString('en-US', { timeZone: 'America/Montevideo' })
# Python 3.9+
from zoneinfo import ZoneInfo
from datetime import datetime
datetime.now(ZoneInfo('America/Montevideo'))
// Java
java.time.ZonedDateTime.now(java.time.ZoneId.of("America/Montevideo"))
// Go
loc, _ := time.LoadLocation("America/Montevideo")
time.Now().In(loc)
-- PostgreSQL
SELECT now() AT TIME ZONE 'America/Montevideo';
# Shell
TZ='America/Montevideo' datePlatforms ship their own copy of tzdata and update it on their own schedule. After a rule change, outputs can differ until the platform updates; this page uses tzdata 2026f.