On Mon, 27 Feb 2012, Robert Elz wrote:
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.
That article seems clear enough that Creston has been at -07:00 since June 1918, but it's not very clear when transitions occured back and forth between PDT (-08:00 standard offset, plus 01:00 DST adjustment) and MST (-07:00 standard offset, no DST adjustment). I'd suggest at least adding a comment to note this uncertainty. --apb (Alan Barrett)