America/Creston

Time zone identifier: America/Creston

Current civil offset: -07:00 (MST)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1884-01-01

Local Mean Time (LMT): -07:46:04 based on geographic meridian

Total recorded transitions: 3 transitions across 3 distinct offsets

Associated countries: CA

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Historical Offset Step Chart (1880 to Present)

-9:00 -8:00 -7:00 -6:00 1880 1900 1920 1940 1960 1980 2000 2020

Text summary: America/Creston shifted between 3 distinct offsets from 1884-01-01 through the modern era.

Complete Transition History (3 Transitions)

UTC Instant Local Wall Time Shift Abbreviation DST Effect
1884-01-01T07:46:04Z 1884-01-01 00:46:04 -07:46:04 → -07:00 MST No gap
1916-10-01T07:00:00Z 1916-09-30 23:00:00 -07:00 → -08:00 PST No overlap
1918-06-02T08:00:00Z 1918-06-02 01:00:00 -08:00 → -07:00 MST No gap

Notes from the Maintainers

Source: backzone (Lines 553 to 604)
From Chris Walton (2011-12-01):
There are two areas within the Canadian province of British Columbia
that do not currently observe daylight saving:
a) The Creston Valley (includes the town of Creston and surrounding area)
b) The eastern half of the Peace River Regional District
(includes the cities of Dawson Creek and Fort St. John)

Earlier this year I stumbled across a detailed article about the time
keeping history of Creston; it was written by Tammy Hardwick who is the
manager of the Creston & District Museum. The article was written in May 2009.
http://www.ilovecreston.com/?p=articles&t=spec&ar=260
According to the article, Creston has not changed its clocks since June 1918.
i.e. Creston has been stuck on UT-7 for 93 years.
Dawson Creek, on the other hand, changed its clocks as recently as April 1972.

Unfortunately the exact date for the time change in June 1918 remains
unknown and will be difficult to ascertain.  I e-mailed Tammy a few months
ago to ask if Sunday June 2 was a reasonable guess.  She said it was just
as plausible as any other date (in June).  She also said that after writing
the article she had discovered another time change in 1916; this is the
subject of another article which she wrote in October 2010.
http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56

Here is a summary of the three clock change events in Creston's history:
1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7)
Exact date unknown
2. Oct 1916: switch to Pacific Standard Time (GMT-8)
Exact date in October unknown; Sunday October 1 is a reasonable guess.
3. June 1918: switch to Pacific Daylight Time (GMT-7)
Exact date in June unknown; Sunday June 2 is a reasonable guess.
note 1:
On Oct 27/1918 when daylight saving ended in the rest of Canada,
Creston did not change its clocks.
note 2:
During WWII when the Federal Government legislated a mandatory clock change,
Creston did not oblige.
note 3:
There is no guarantee that Creston will remain on Mountain Standard Time
(UTC-7) forever.
The subject was debated at least once this year by the town Council.
http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html

During a period WWII, summer time (Daylight saying) was mandatory in Canada.
In Creston, that was handled by shifting the area to PST (-8:00) then applying
summer time to cause the offset to be -7:00, the same as it had been before
the change.  It can be argued that the timezone abbreviation during this
period should be PDT rather than MST, but that doesn't seem important enough
(to anyone) to further complicate the rules.

The transition dates (and times) are guesses.

Attributed Statements:

Chris Walton (2011-12-01):

There are two areas within the Canadian province of British Columbia that do not currently observe daylight saving: a) The Creston Valley (includes the town of Creston and surrounding area) b) The eastern half of the Peace River Regional District (includes the cities of Dawson Creek and Fort St. John) Earlier this year I stumbled across a detailed article about the time keeping history of Creston; it was written by Tammy Hardwick who is the manager of the Creston & District Museum. The article was written in May 2009. http://www.ilovecreston.com/?p=articles&t=spec&ar=260 According to the article, Creston has not changed its clocks since June 1918. i.e. Creston has been stuck on UT-7 for 93 years. Dawson Creek, on the other hand, changed its clocks as recently as April 1972. Unfortunately the exact date for the time change in June 1918 remains unknown and will be difficult to ascertain. I e-mailed Tammy a few months ago to ask if Sunday June 2 was a reasonable guess. She said it was just as plausible as any other date (in June). She also said that after writing the article she had discovered another time change in 1916; this is the subject of another article which she wrote in October 2010. http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56 Here is a summary of the three clock change events in Creston's history: 1. 1884 or 1885: adoption of Mountain Standard Time (GMT-7) Exact date unknown 2. Oct 1916: switch to Pacific Standard Time (GMT-8) Exact date in October unknown; Sunday October 1 is a reasonable guess. 3. June 1918: switch to Pacific Daylight Time (GMT-7) Exact date in June unknown; Sunday June 2 is a reasonable guess. note 1: On Oct 27/1918 when daylight saving ended in the rest of Canada, Creston did not change its clocks. note 2: During WWII when the Federal Government legislated a mandatory clock change, Creston did not oblige. note 3: There is no guarantee that Creston will remain on Mountain Standard Time (UTC-7) forever. The subject was debated at least once this year by the town Council. http://www.bclocalnews.com/kootenay_rockies/crestonvalleyadvance/news/116760809.html During a period WWII, summer time (Daylight saying) was mandatory in Canada. In Creston, that was handled by shifting the area to PST (-8:00) then applying summer time to cause the offset to be -7:00, the same as it had been before the change. It can be argued that the timezone abbreviation during this period should be PDT rather than MST, but that doesn't seem important enough (to anyone) to further complicate the rules. The transition dates (and times) are guesses.

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.