On 2020-03-07 08:32, Chris Walton wrote:
From: tz <tz-bounces@iana.org> On Behalf Of Brian Inglis Sent: March 6, 2020 5:07 PM To: tz@iana.org Subject: Re: [tz] Yukon to move to year-round PDT
On 2020-03-05 16:10, Chris Walton wrote:
I agree with Michael D.
There are four existing zones that are already on permanent UTC-7: America/Dawson_Creek America/Creston America/Fort_Nelson America/Phoenix None of these zones makes use the DST bit. The time zone is displayed year round as MST instead of PDT. I don't think anybody complains about it.
I don't see any compelling reason to treat the two Yukon zones (America/Whitehorse & America/Dawson) any differently than the four existing UTC-7 zones.
Historic timestamps? Historic timestamps and their time zone abbreviations do not change. Nobody is suggesting that they should be changed. e.g. America/Dawson already supports all the historical time zone abbreviations that have been used in Yukon Territory since 1900: PDT, PST, YDDT, YDT, YPT, YST , & YWT. The proposed change would force all dates that occur after March 14/2021 to have an MST time zone abbreviation. All dates that occur before March 14/2021 would continue to be displayed with the correct historical time zone abbreviations. Correction: the change takes place this upcoming weekend (March 8/2020). It is not March 14/2021 as I indicated in my previous e-mail.
The change takes place in November; this weekend proceeds as normal. OK. The wording in the new release says "The spring 2020 seasonal time change will go ahead as planned this Sunday, March 8. After that, Yukon will remain on Pacific Daylight Saving Time." Thus any new time zone rules don't technically need to take effect until Nov 1/2020. A change in November could be handled similarly to the America/Grand_Turk change that took place on Nov 1 2015 in which: a) the time of day did not change (i.e. nobody had to reset their clocks or watches). b) time zone abbreviation flipped from EDT to AST. $ zdump -v America/Grand_Turk | grep '2015 UTC = Sun Nov 1' America/Grand_Turk Sun Nov 1 05:59:59 2015 UTC = Sun Nov 1 01:59:59 2015 EDT isdst=1 gmtoff=-14400 America/Grand_Turk Sun Nov 1 06:00:00 2015 UTC = Sun Nov 1 02:00:00 2015 AST isdst=0 gmtoff=-14400 -chris
As one of the boots on the ground (living in America/Whitehorse), I'd say that seeing MST as the Yukon time zone would be very confusing, and might meet strong resistance, given that we've been aligned with BC (PST/PDT) for a generation. Furthermore, if BC also switches to permanent MST/PDT then you would be facing a far more populous region likely completely unenamoured with being lumped in with Alberta. Perhaps the solution for America/Whitehorse and America/Dawson is to resurrect YST (-07). Would that be an option? I'll write to the minister to see what he says (it's a small town :) Erik