America/Argentina/Mendoza time zone
10:49AMUTC−3
UTC−3UTC−3+2 h vs New York (you)
No transitions: America/Argentina/Mendoza stays on UTC−3.
About America/Argentina/Mendoza
America/Argentina/Mendoza is the IANA time zone for Mendoza (MZ) in Argentina. It currently keeps UTC−3 all year.
Its principal location is Mendoza at 32.88° S, 68.82° 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/Argentina/Mendoza since 1970
The record starts with local mean time (UTC−4:35), which ended on October 31, 1894. The first daylight saving time in the record is in 1930.
| Years | Clocks | Abbreviations |
|---|---|---|
| 1970–1973 | UTC−3 all year | — |
| 1974 | mostly UTC−3; also UTC−2 for part of the year | — |
| 1975–1987 | UTC−3 all year | — |
| 1988 | UTC−3 until December 1, then UTC−2 | — |
| 1989 | UTC−3 in winter, UTC−2 in summer | — |
| 1990 | UTC−4 in winter, UTC−2 in summer; also UTC−3 for part of the year | — |
| 1991 | UTC−4 in winter, UTC−3 in summer | — |
| 1992 | UTC−4 in winter, UTC−3 in summer; also UTC−2 for part of the year | — |
| 1993 | UTC−2 until March 7, then UTC−3 | — |
| 1994–2003 | UTC−3 all year | — |
| 2004 | UTC−4 in winter, UTC−3 in summer | — |
| 2005–2006 | UTC−3 all year | — |
| 2007 | UTC−3 until December 30, then UTC−2 | — |
| 2008 | UTC−2 until March 16, then UTC−3 | — |
| 2009 onward | UTC−3 all year | — |
Before 1970
43 offset changes before 1970 in the record; the first 12 and the last 12:
- Wednesday, October 31, 1894: UTC−4:35 → UTC−4:17 (CMT)
- Friday, April 30, 1920: UTC−4:17 → UTC−4
- Monday, December 1, 1930: UTC−4 → UTC−3, daylight saving time
- Wednesday, April 1, 1931: UTC−3 → UTC−4
- Thursday, October 15, 1931: UTC−4 → UTC−3, daylight saving time
- Tuesday, March 1, 1932: UTC−3 → UTC−4
- Tuesday, November 1, 1932: UTC−4 → UTC−3, daylight saving time
- Wednesday, March 1, 1933: UTC−3 → UTC−4
- Wednesday, November 1, 1933: UTC−4 → UTC−3, daylight saving time
- Thursday, March 1, 1934: UTC−3 → UTC−4
- Thursday, November 1, 1934: UTC−4 → UTC−3, daylight saving time
- Friday, March 1, 1935: UTC−3 → UTC−4
- Sunday, March 1, 1964: UTC−3 → UTC−4
- Thursday, October 15, 1964: UTC−4 → UTC−3, daylight saving time
- Monday, March 1, 1965: UTC−3 → UTC−4
- Friday, October 15, 1965: UTC−4 → UTC−3, daylight saving time
- Tuesday, March 1, 1966: UTC−3 → UTC−4
- Saturday, October 15, 1966: UTC−4 → UTC−3, daylight saving time
- Sunday, April 2, 1967: UTC−3 → UTC−4
- Sunday, October 1, 1967: UTC−4 → UTC−3, daylight saving time
- Sunday, April 7, 1968: UTC−3 → UTC−4
- Sunday, October 6, 1968: UTC−4 → UTC−3, daylight saving time
- Sunday, April 6, 1969: UTC−3 → UTC−4
- Sunday, October 5, 1969: UTC−4 → UTC−3
Changes of the winter (standard) offset: Sunday, October 5, 1969, UTC−4 → UTC−3; Sunday, October 15, 1989, UTC−3 → UTC−4; Sunday, October 18, 1992, UTC−4 → 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
These older or country-specific IDs are links to America/Argentina/Mendoza in tzdata. Their pages redirect here: America/Mendoza.
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/Rio_Gallegos, America/Argentina/Salta, America/Argentina/San_Juan, America/Argentina/San_Luis, America/Argentina/Tucuman, America/Argentina/Ushuaia.
Convert Mendoza time
Using America/Argentina/Mendoza 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/Argentina/Mendoza' })
# Python 3.9+
from zoneinfo import ZoneInfo
from datetime import datetime
datetime.now(ZoneInfo('America/Argentina/Mendoza'))
// Java
java.time.ZonedDateTime.now(java.time.ZoneId.of("America/Argentina/Mendoza"))
// Go
loc, _ := time.LoadLocation("America/Argentina/Mendoza")
time.Now().In(loc)
-- PostgreSQL
SELECT now() AT TIME ZONE 'America/Argentina/Mendoza';
# Shell
TZ='America/Argentina/Mendoza' 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.