America/Argentina/San_Luis

Time zone identifier: America/Argentina/San_Luis

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

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1894-10-31

Local Mean Time (LMT): -04:25:24 based on geographic meridian

Total recorded transitions: 62 transitions across 5 distinct offsets

Associated countries: AR

Historical Offset Step Chart (1880 to Present)

Text summary: America/Argentina/San_Luis shifted between 5 distinct offsets from 1894-10-31 through the modern era.

Complete Transition History (62 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1894-10-31T04:25:24Z`	`1894-10-31 00:08:36`	-04:25:24 → -04:16:48	`CMT`	No	gap
`1920-05-01T04:16:48Z`	`1920-05-01 00:16:48`	-04:16:48 → -04:00	`-04`	No	gap
`1930-12-01T04:00:00Z`	`1930-12-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1931-04-01T03:00:00Z`	`1931-03-31 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1931-10-15T04:00:00Z`	`1931-10-15 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1932-03-01T03:00:00Z`	`1932-02-29 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1932-11-01T04:00:00Z`	`1932-11-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1933-03-01T03:00:00Z`	`1933-02-28 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1933-11-01T04:00:00Z`	`1933-11-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1934-03-01T03:00:00Z`	`1934-02-28 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1934-11-01T04:00:00Z`	`1934-11-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1935-03-01T03:00:00Z`	`1935-02-28 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1935-11-01T04:00:00Z`	`1935-11-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1936-03-01T03:00:00Z`	`1936-02-29 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1936-11-01T04:00:00Z`	`1936-11-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1937-03-01T03:00:00Z`	`1937-02-28 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1937-11-01T04:00:00Z`	`1937-11-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1938-03-01T03:00:00Z`	`1938-02-28 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1938-11-01T04:00:00Z`	`1938-11-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1939-03-01T03:00:00Z`	`1939-02-28 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1939-11-01T04:00:00Z`	`1939-11-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1940-03-01T03:00:00Z`	`1940-02-29 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1940-07-01T04:00:00Z`	`1940-07-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1941-06-15T03:00:00Z`	`1941-06-14 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1941-10-15T04:00:00Z`	`1941-10-15 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1943-08-01T03:00:00Z`	`1943-07-31 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1943-10-15T04:00:00Z`	`1943-10-15 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1946-03-01T03:00:00Z`	`1946-02-28 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1946-10-01T04:00:00Z`	`1946-10-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1963-10-01T03:00:00Z`	`1963-09-30 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1963-12-15T04:00:00Z`	`1963-12-15 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1964-03-01T03:00:00Z`	`1964-02-29 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1964-10-15T04:00:00Z`	`1964-10-15 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1965-03-01T03:00:00Z`	`1965-02-28 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1965-10-15T04:00:00Z`	`1965-10-15 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1966-03-01T03:00:00Z`	`1966-02-28 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1966-10-15T04:00:00Z`	`1966-10-15 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1967-04-02T03:00:00Z`	`1967-04-01 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1967-10-01T04:00:00Z`	`1967-10-01 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1968-04-07T03:00:00Z`	`1968-04-06 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1968-10-06T04:00:00Z`	`1968-10-06 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1969-04-06T03:00:00Z`	`1969-04-05 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1969-10-05T04:00:00Z`	`1969-10-05 01:00:00`	-04:00 → -03:00	`-03`	No	gap
`1974-01-23T03:00:00Z`	`1974-01-23 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1974-05-01T02:00:00Z`	`1974-04-30 23:00:00`	-02:00 → -03:00	`-03`	No	overlap
`1988-12-01T03:00:00Z`	`1988-12-01 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
`1989-10-15T03:00:00Z`	`1989-10-15 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`1990-03-14T02:00:00Z`	`1990-03-13 22:00:00`	-02:00 → -04:00	`-04`	No	overlap
`1990-10-15T04:00:00Z`	`1990-10-15 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`1991-03-01T03:00:00Z`	`1991-02-28 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`1991-06-01T04:00:00Z`	`1991-06-01 01:00:00`	-04:00 → -03:00	`-03`	No	gap
`1999-10-03T03:00:00Z`	`1999-10-03 00:00:00`	-03:00 → -03:00	`-03`	Yes	offset-only
`2000-03-03T03:00:00Z`	`2000-03-03 00:00:00`	-03:00 → -03:00	`-03`	No	offset-only
`2004-05-31T03:00:00Z`	`2004-05-30 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`2004-07-25T04:00:00Z`	`2004-07-25 01:00:00`	-04:00 → -03:00	`-03`	No	gap
`2007-12-30T03:00:00Z`	`2007-12-30 01:00:00`	-03:00 → -02:00	`-02`	Yes	gap
`2008-01-21T02:00:00Z`	`2008-01-20 23:00:00`	-02:00 → -03:00	`-03`	Yes	overlap
`2008-03-09T03:00:00Z`	`2008-03-08 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`2008-10-12T04:00:00Z`	`2008-10-12 01:00:00`	-04:00 → -03:00	`-03`	Yes	gap
`2009-03-08T03:00:00Z`	`2009-03-07 23:00:00`	-03:00 → -04:00	`-04`	No	overlap
`2009-10-11T04:00:00Z`	`2009-10-11 01:00:00`	-04:00 → -03:00	`-03`	No	gap

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.