America/Costa_Rica

Time zone identifier: America/Costa_Rica

Current civil offset: -06:00 (CST)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1890-01-01

Local Mean Time (LMT): -05:36:13 based on geographic meridian

Total recorded transitions: 10 transitions across 3 distinct offsets

Associated countries: CR

Historical Offset Step Chart (1880 to Present)

Text summary: America/Costa_Rica shifted between 3 distinct offsets from 1890-01-01 through the modern era.

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1890-01-01T05:36:13Z`	`1890-01-01 00:00:00`	-05:36:13 → -05:36:13	`SJMT`	No	offset-only
`1921-01-15T05:36:13Z`	`1921-01-14 23:36:13`	-05:36:13 → -06:00	`CST`	No	overlap
`1979-02-25T06:00:00Z`	`1979-02-25 01:00:00`	-06:00 → -05:00	`CDT`	Yes	gap
`1979-06-03T05:00:00Z`	`1979-06-02 23:00:00`	-05:00 → -06:00	`CST`	No	overlap
`1980-02-24T06:00:00Z`	`1980-02-24 01:00:00`	-06:00 → -05:00	`CDT`	Yes	gap
`1980-06-01T05:00:00Z`	`1980-05-31 23:00:00`	-05:00 → -06:00	`CST`	No	overlap
`1991-01-19T06:00:00Z`	`1991-01-19 01:00:00`	-06:00 → -05:00	`CDT`	Yes	gap
`1991-07-01T05:00:00Z`	`1991-06-30 23:00:00`	-05:00 → -06:00	`CST`	No	overlap
`1992-01-18T06:00:00Z`	`1992-01-18 01:00:00`	-06:00 → -05:00	`CDT`	Yes	gap
`1992-03-15T05:00:00Z`	`1992-03-14 23:00:00`	-05:00 → -06:00	`CST`	No	overlap

Source: northamerica (Lines 3292 to 3294)

There are too many San Josés elsewhere, so we'll use 'Costa Rica'.
Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
STDOFF	-5:36:13.3

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