Pacific/Midway

Time zone identifier: Pacific/Midway

Current civil offset: -11:00 (SST)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1901-01-01

Local Mean Time (LMT): -11:49:28 based on geographic meridian

Total recorded transitions: 3 transitions across 3 distinct offsets

Associated countries: UM

Historical Offset Step Chart (1880 to Present)

Text summary: Pacific/Midway shifted between 3 distinct offsets from 1901-01-01 through the modern era.

Complete Transition History (3 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1901-01-01T11:49:28Z`	`1901-01-01 00:49:28`	-11:49:28 → -11:00	`-11`	No	gap
`1956-06-03T11:00:00Z`	`1956-06-03 01:00:00`	-11:00 → -10:00	`-10`	Yes	gap
`1956-09-02T10:00:00Z`	`1956-09-01 23:00:00`	-10:00 → -11:00	`SST`	No	overlap

Notes from the Maintainers

Source: backzone (Lines 1757 to 1768)

Midway

From Mark Brader (2005-01-23):
[<https://www.timetableimages.com/ttimages/pa/pa36/pa36.pdf>]
reproduced a Pan American Airways timetable from 1936, for their weekly
"Orient Express" flights between San Francisco and Manila, and connecting
flights to Chicago and the US East Coast.  As it uses some time zone
designations that I've never seen before:....
Fri. 6:30A Lv. HONOLULU (Pearl Harbor), H.I. . H.L.T. Ar. 5:30P Sun.
"   3:00P Ar. MIDWAY ISLAND . . . . . . . . . M.L.T. Lv. 6:00A  "

Attributed Statements:

Mark Brader (2005-01-23):

[<https://www.timetableimages.com/ttimages/pa/pa36/pa36.pdf>] reproduced a Pan American Airways timetable from 1936, for their weekly "Orient Express" flights between San Francisco and Manila, and connecting flights to Chicago and the US East Coast. As it uses some time zone designations that I've never seen before:.... Fri. 6:30A Lv. HONOLULU (Pearl Harbor), H.I. . H.L.T. Ar. 5:30P Sun. " 3:00P Ar. MIDWAY ISLAND . . . . . . . . . M.L.T. Lv. 6:00A "

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.