[tz] question re zone America/Punta_Arenas in Chile

[Tim Parenti]

On Fri, 18 Mar 2022 at 10:09, Michael H Deckers <
michael.h.deckers at googlemail.com> wrote:

>     • Law Number 8,522 was promulgated on 1946-08-28, not the day before.
>

The text of the law specifies that it was *promulgated* (that is, made
known) on Tuesday 1946-08-27, but it was *published* in 'Diario Oficial'
the following day.  But since Article 3 states that the law would come into
force from the date of its publication, the conclusion is the same: The law
came into force on Wednesday 1946-08-28.

    • That law contains an "artícolo transitorio"


Good catch.  This greatly simplifies the apparent corner cases which Paul
had discussed in his 1 July message and gives a reasonably clear date for a
single transition in central Chile, also 1946-08-28.

    It would take further evidence (such as newspaper clips) in
>     order to ascertain the precise hour of the switch in both
>     cases. The proposed change implies switches at different
>     instants.
>

Although this is technically true as the two zones were off by an hour
prior to this 1946-08-28 transition, it was a no-op for wall-clocks in
Chile's northern and southern regions.

On Fri, 1 Jul 2022 at 14:13, Paul Eggert via tz <tz at iana.org> wrote:

> I expect it's better to set the DST flag
> when the new law said DST started.


Lacking further specificity, let's presume the change came into effect in
Santiago and central Chile at 24:00 -03.  Similarly, let's change the DST
bit for the rest of the mainland an hour later, when they reached 24:00
-04, as that's most consistent with Chile's general history of midnight
transitions.

Proposed further patch attached and installed into the development repo.

--
Tim Parenti
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