[tz] Creston

[Chris Walton]

> OK, this is what I propose now for America/Creston ...
> 
> Zone America/Creston    -7:46:04 -      LMT     1884
>                         -8:00   -       PST     1918 Jun 2
>                         -7:00   -       MST
> 
> As best I can tell, from reading the article that inspired the need
> for the new zone
> 	http://www.ilovecreston.com/?p=articles&t=spec&ar=260
> this reflects (close enough anyway I think) what has actually happened.
> LMT until 1884, PST until June 1918, then MST ever since.
> 


Robert,
Please don't hold up the next release of the database on account of America/Creston!
Changes to current rules in existing zones should take precedence over the introduction of historical entries.

But assuming everything else is taken care of...
Tammy Hardwick from the Creston museum published "two" articles.
I provided URLs for both articles in my original "America/Creston" posting.  Here they are again:
#1 written May 2009: http://www.ilovecreston.com/?p=articles&t=spec&ar=260
#2 written Oct 2010: http://www.creston.museum.bc.ca/index.php?module=comments&uop=view_comment&cm+id=56
You need to read "both" articles to get the full story.
The second article states:
 "Creston was on Mountain Time from the adoption of standard time in 1885, until October 1916"
This fact is omitted from your simplified proposal for America/Creston.

Creston (as far as know) was the only region in Canada that did not change its clocks when ordered to do so by the Federal government in 1942.  It changed the time zone from MST(GMT-7) to PDT(GMT-7) as a means of avoiding a clock change.
That is why I included rules for 1942 and 1945 even though the rules maintain a constant offset of seven hours from UTC.

For discussion purposes I have included my two original proposals below.
I also included a third proposal that does not show the use of PDT between 1942 and 1945.


__Proposal #1 (same as I posted Dec 1/2011)__
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Creston    -7:46:04 -      LMT     1884
                        -7:00   -       MST     1916 Oct 1
                        -8:00   -       PST     1918 Jun 2
                        -8:00   1:00    PDT     1918 Oct 27 2:00
                        -7:00   -       MST     1942 Feb  9 2:00
                        -8:00   Canada  P%sT    1945 Sep 30 2:00
                        -7:00   -       MST

__Proposal #2 (same as I posted Dec 1/2011)__
This proposal omits the exact dates in Oct 1916 and June 1918 could since we don't know what they are; this forces zic to default to Oct 1/1916 and June 1/1918.
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Creston    -7:46:04 -      LMT     1884
                        -7:00   -       MST     1916 Oct
                        -8:00   -       PST     1918 Jun
                        -8:00   1:00    PDT     1918 Oct 27 2:00
                        -7:00   -       MST     1942 Feb  9 2:00
                        -8:00   Canada  P%sT    1945 Sep 30 2:00
                        -7:00   -       MST

__Proposal #3 (new)
This proposal is a simplification which does not reflect what Creston did to avoid the mandated clock change in 1942.
The actual time offsets from UTC are the same as in proposal #1
# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
Zone America/Creston    -7:46:04 -      LMT     1884
                        -7:00   -       MST     1916 Oct 1
                        -8:00   -       PST     1918 Jun 2
                        -8:00   1:00    PDT     1918 Oct 27 2:00
                        -7:00   -       MST


-chris