Pacific/Chuuk

Time zone identifier: Pacific/Chuuk

Current civil offset: +10:00 (+10)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1844-12-31

Local Mean Time (LMT): -13:52:52 based on geographic meridian

Total recorded transitions: 6 transitions across 4 distinct offsets

Associated countries: FM

Aliases (Link targets): Pacific/Truk, Pacific/Yap

Historical Offset Step Chart (1880 to Present)

Text summary: Pacific/Chuuk shifted between 4 distinct offsets from 1844-12-31 through the modern era.

Complete Transition History (6 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1844-12-31T13:52:52Z`	`1845-01-01 00:00:00`	-13:52:52 → +10:07:08	`LMT`	No	gap
`1900-12-31T13:52:52Z`	`1900-12-31 23:52:52`	+10:07:08 → +10:00	`+10`	No	overlap
`1914-09-30T14:00:00Z`	`1914-09-30 23:00:00`	+10:00 → +09:00	`+09`	No	overlap
`1919-01-31T15:00:00Z`	`1919-02-01 01:00:00`	+09:00 → +10:00	`+10`	No	gap
`1941-03-31T14:00:00Z`	`1941-03-31 23:00:00`	+10:00 → +09:00	`+09`	No	overlap
`1945-07-31T15:00:00Z`	`1945-08-01 01:00:00`	+09:00 → +10:00	`+10`	No	gap

Notes from the Maintainers

Source: backzone (Lines 1697 to 1718)

Scattered Islands (Îles Éparses) administered from Réunion are as follows.
The following information about them is taken from
Îles Éparses (<http://www.outre-mer.gouv.fr/domtom/ile.htm>, 1997-07-22,
in French; no longer available as of 1999-08-17).
We have no info about their time zone histories.

Bassas da India - uninhabited
Europa Island - inhabited from 1905 to 1910 by two families
Glorioso Is - inhabited until at least 1958
Juan de Nova - uninhabited
Tromelin - inhabited until at least 1958

Micronesia
Also see Pacific/Pohnpei and commentary for Micronesia in 'australasia'.

From Paul Eggert (2018-11-18):
Alan Eugene Davis writes (1996-03-16),
"I am certain, having lived there for the past decade, that 'Truk'
(now properly known as Chuuk) ... is in the time zone GMT+10."
Shanks & Pottenger write that Truk switched from UT +10 to +11
on 1978-10-01; ignore this for now.

Attributed Statements:

Paul Eggert (2018-11-18):

Alan Eugene Davis writes (1996-03-16), "I am certain, having lived there for the past decade, that 'Truk' (now properly known as Chuuk) ... is in the time zone GMT+10." Shanks & Pottenger write that Truk switched from UT +10 to +11 on 1978-10-01; ignore this for now.

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.