[tz] Error for Chile on September 2023

[Jacqueline Seron]

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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