Africa/Monrovia

Time zone identifier: Africa/Monrovia

Current civil offset: +00:00 (GMT)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1882-01-01

Local Mean Time (LMT): -00:43:08 based on geographic meridian

Total recorded transitions: 3 transitions across 3 distinct offsets

Associated countries: LR

Historical Offset Step Chart (1880 to Present)

Text summary: Africa/Monrovia shifted between 3 distinct offsets from 1882-01-01 through the modern era.

Complete Transition History (3 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1882-01-01T00:43:08Z`	`1882-01-01 00:00:00`	-00:43:08 → -00:43:08	`MMT`	No	offset-only
`1919-03-01T00:43:08Z`	`1919-02-28 23:58:38`	-00:43:08 → -00:44:30	`MMT`	No	overlap
`1972-01-07T00:44:30Z`	`1972-01-07 00:44:30`	-00:44:30 → +00:00	`GMT`	No	gap

Notes from the Maintainers

Source: africa (Lines 423 to 440)

Liberia

From Paul Eggert (2017-03-02):

The Nautical Almanac for the Year 1970, p 264, is the source for -0:44:30.

In 1972 Liberia was the last country to switch from a UT offset
that was not a multiple of 15 or 20 minutes.  The 1972 change was on
1972-01-07, according to an entry dated 1972-01-04 on p 330 of:
Presidential Papers: First year of the administration of
President William R. Tolbert, Jr., July 23, 1971-July 31, 1972.
Monrovia: Executive Mansion.

Use the abbreviation "MMT" before 1972, as the more accurate numeric
abbreviation "-004430" would be one byte over the POSIX limit.

Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]

Attributed Statements:

Paul Eggert (2017-03-02):

The Nautical Almanac for the Year 1970, p 264, is the source for -0:44:30. In 1972 Liberia was the last country to switch from a UT offset that was not a multiple of 15 or 20 minutes. The 1972 change was on 1972-01-07, according to an entry dated 1972-01-04 on p 330 of: Presidential Papers: First year of the administration of President William R. Tolbert, Jr., July 23, 1971-July 31, 1972. Monrovia: Executive Mansion. Use the abbreviation "MMT" before 1972, as the more accurate numeric abbreviation "-004430" would be one byte over the POSIX limit. Zone NAME STDOFF RULES FORMAT [UNTIL]

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.