[tz] Error for Chile on September 2023
Jacqueline Seron
jacqueline.seron at noirlab.edu
Mon Nov 6 23:29:22 UTC 2023
Thank you Brian
cc previous people included in communication
I'm so sorry for the confusion and wasting your time,
I see in the Chile file the change I mentioned in a comment from Juan
Correa (2022-08-09)
It seems the python library I'm using doesn't have a record of this change.
Again, my apologies!
On Mon, Nov 6, 2023 at 8:08 PM Brian Inglis <Brian.Inglis at shaw.ca> wrote:
> On 2023-11-06 15:47, Doug Ewell via tz wrote:
> > Guy Harris wrote:
> >>> 2. Starting at midnight on the first Saturday of the month of
> >>> September 2023 and until midnight on the first Saturday of the month
> >>> of April 2024, the official time will be advanced by 60 minutes.
>
> >> Presumably meaning "Starting at midnight at the end of the first
> >> Saturday of the month of September 2023", as the last Rule entry for
> >> Chile is
>
> >> Rule Chile 2023 max - Sep Sun>=2 4:00u
> 1:00 -
>
> > Correct and understood; the decree’s “midnight on [viz. at the end of]
> > Saturday” (here, the 2nd) is equivalent to my “midnight at the start of
> > Sunday” (here, the 3rd). But it could not refer in any way to the 11th.
> The rules use Sun >= 2 becuse the time specified with "u" is UTC not
> local, it
> is the same as Sun >= 1 (1st Sunday) in local time; and Sun >= 9 Z => Sun
> >= 8
> local (2nd Sunday) in 2022 only.
>
> So Sun 3 & 10 would be "4" & "11" for these rules.
>
> I think the OP has generalized from a single data point, and may think the
> 2022
> change on 2nd Sunday was meant to continue, but that was reverted for 2023
> on:
>
> Rule Chile 2019 max - Apr Sun>=2 3:00u 0 -
> Rule Chile 2019 2021 - Sep Sun>=2 4:00u 1:00 -
> Rule Chile 2022 only - Sep Sun>=9 4:00u 1:00 -
> Rule Chile 2023 max - Sep Sun>=2 4:00u 1:00 -
>
> See https://github.com/eggert/tz/blob/main/southamerica#L1318 for Chile's
> DST
> history
>
> --
> Take care. Thanks, Brian Inglis Calgary, Alberta, Canada
>
> La perfection est atteinte Perfection is achieved
> non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to
> add
> mais lorsqu'il n'y a plus rien à retirer but when there is no more to
> cut
> -- Antoine de Saint-Exupéry
>
--
Jacqueline Seron N.
NOIRLab - AURA
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