Africa/Bissau

Time zone identifier: Africa/Bissau

Current civil offset: +00:00 (GMT)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1912-01-01

Local Mean Time (LMT): -01:02:20 based on geographic meridian

Total recorded transitions: 2 transitions across 3 distinct offsets

Associated countries: GW

Historical Offset Step Chart (1880 to Present)

Text summary: Africa/Bissau shifted between 3 distinct offsets from 1912-01-01 through the modern era.

Complete Transition History (2 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1912-01-01T01:00:00Z`	`1912-01-01 00:00:00`	-01:02:20 → -01:00	`-01`	No	gap
`1975-01-01T01:00:00Z`	`1975-01-01 01:00:00`	-01:00 → +00:00	`GMT`	No	gap

Notes from the Maintainers

Source: africa (Lines 345 to 351)

Guinea-Bissau

From Tim Parenti (2024-07-01), per Paul Eggert (2018-02-16):
For timestamps before independence, see commentary for Europe/Lisbon.

Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]

Attributed Statements:

Tim Parenti (2024-07-01):

For timestamps before independence, see commentary for Europe/Lisbon. 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.