Pacific/Saipan

Time zone identifier: Pacific/Saipan

Current civil offset: +10:00 (ChST)

Current DST state: Observing Standard Time

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

Local Mean Time (LMT): -14:17 based on geographic meridian

Total recorded transitions: 20 transitions across 5 distinct offsets

Associated countries: MP

Historical Offset Step Chart (1880 to Present)

Text summary: Pacific/Saipan shifted between 5 distinct offsets from 1844-12-31 through the modern era.

Complete Transition History (20 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1844-12-31T14:17:00Z`	`1845-01-01 00:00:00`	-14:17 → +09:43	`LMT`	No	gap
`1900-12-31T14:17:00Z`	`1900-12-31 23:17:00`	+09:43 → +09:00	`+09`	No	overlap
`1944-07-08T15:00:00Z`	`1944-07-09 01:00:00`	+09:00 → +10:00	`GST`	No	gap
`1959-06-26T16:00:00Z`	`1959-06-27 03:00:00`	+10:00 → +11:00	`GDT`	Yes	gap
`1961-01-28T15:00:00Z`	`1961-01-29 01:00:00`	+11:00 → +10:00	`GST`	No	overlap
`1967-08-31T16:00:00Z`	`1967-09-01 03:00:00`	+10:00 → +11:00	`GDT`	Yes	gap
`1969-01-25T13:01:00Z`	`1969-01-25 23:01:00`	+11:00 → +10:00	`GST`	No	overlap
`1969-06-21T16:00:00Z`	`1969-06-22 03:00:00`	+10:00 → +11:00	`GDT`	Yes	gap
`1969-08-30T15:00:00Z`	`1969-08-31 01:00:00`	+11:00 → +10:00	`GST`	No	overlap
`1970-04-25T16:00:00Z`	`1970-04-26 03:00:00`	+10:00 → +11:00	`GDT`	Yes	gap
`1970-09-05T15:00:00Z`	`1970-09-06 01:00:00`	+11:00 → +10:00	`GST`	No	overlap
`1971-04-24T16:00:00Z`	`1971-04-25 03:00:00`	+10:00 → +11:00	`GDT`	Yes	gap
`1971-09-04T15:00:00Z`	`1971-09-05 01:00:00`	+11:00 → +10:00	`GST`	No	overlap
`1973-12-15T16:00:00Z`	`1973-12-16 03:00:00`	+10:00 → +11:00	`GDT`	Yes	gap
`1974-02-23T15:00:00Z`	`1974-02-24 01:00:00`	+11:00 → +10:00	`GST`	No	overlap
`1976-05-25T16:00:00Z`	`1976-05-26 03:00:00`	+10:00 → +11:00	`GDT`	Yes	gap
`1976-08-21T15:01:00Z`	`1976-08-22 01:01:00`	+11:00 → +10:00	`GST`	No	overlap
`1977-04-23T16:00:00Z`	`1977-04-24 03:00:00`	+10:00 → +11:00	`GDT`	Yes	gap
`1977-08-27T15:00:00Z`	`1977-08-28 01:00:00`	+11:00 → +10:00	`GST`	No	overlap
`2000-12-22T14:00:00Z`	`2000-12-23 00:00:00`	+10:00 → +10:00	`ChST`	No	offset-only

Notes from the Maintainers

Source: backzone (Lines 1785 to 1796)

N Mariana Is

From Paul Eggert (2022-08-16):
Although Shanks & Pottenger say Saipan used +09 and then switched
to Guam time in October 1969, this is surely wrong.
Saipan used Guam time in the late 1950s; see page 4 of the minutes on the
conference of the 12th Saipan Legislature and the Select Committee on
Saipan Mission, 5th Guam Legislature (1959-09-11):
http://www.nmhcouncil.org/nmhc_archives/U.S.%20Navy%20Civil%20Affairs%20Files%201944-1962/1959/1959%2009%2017%20letter,%20minutes%20of%20conference,%20Borja.pdf
For now, assume Saipan switched to Guam time after the Battle of Saipan.

Attributed Statements:

Paul Eggert (2022-08-16):

Although Shanks & Pottenger say Saipan used +09 and then switched to Guam time in October 1969, this is surely wrong. Saipan used Guam time in the late 1950s; see page 4 of the minutes on the conference of the 12th Saipan Legislature and the Select Committee on Saipan Mission, 5th Guam Legislature (1959-09-11): http://www.nmhcouncil.org/nmhc_archives/U.S.%20Navy%20Civil%20Affairs%20Files%201944-1962/1959/1959%2009%2017%20letter,%20minutes%20of%20conference,%20Borja.pdf For now, assume Saipan switched to Guam time after the Battle of Saipan.

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.