Re: Santiago Time Zone DST information is incorrect for XP

From: Earl F. Parrish (efparri@verizon.net)
Date: 10/01/02 

From: "Earl F. Parrish" <efparri@verizon.net>
Date: Tue, 01 Oct 2002 02:05:51 GMT

"Rocco Corsi" <rocco.corsi@sympatico.ca> wrote in message
news:dd6801c268e0$249a2500$39ef2ecf@TKMSFTNGXA08...
>
> >-----Original Message-----
> >
> >"Rocco Corsi" <rocco.corsi@sympatico.ca> wrote in message
> >news:0c5101c2682a$279eaa20$35ef2ecf@TKMSFTNGXA11...
> >> I just tested the DST for Santiago, Chile by setting
> >> Timezone to "(GMT-04:00) Santiago" and changing date to
> >> 2002/10/11 at 11:59. When midnight hit, DST can into
> >> effect. This is one (1) day early!?!
> >>
> >> What to do?
> >>
> >> Regards,
> >> Rocco Corsi
> >>
> >
> >According to the law, daylight saving time begins on the
> second Saturday in
> >October. If it began at midnight between Saturday and
> Sunday then it would be
> >begin on Sunday. Technically midnight belongs to no
> day. It is a moment
> >dividing one day from another. Just as noon is neither
> AM nor PM. Here is an
> >excerpt from the Chilean law:
> >
> >Supreme Decree Number 1,489 (6 October 1970) - This law,
> enacted during the
> >presidency of Eduardo Frei Montalva, declared that
> Daylight Saving Time will
> >advance clocks by one hour, beginning the second Saturday
> of October, and ending
> >the second Saturday of March. Chilean time is
> administered by the Chilean Navy's
> >Hydrographic and Oceanographic Service (SHOA).
> >
> >Don't you have something better to do in Canada than
> reset your clock? You
> >should have chosen one of those countries with half-hour
> time such as Iran,
> >India or Australia.
> >--
> >Earl F. Parrish
> >
> >
> >
> >.
> >
>
> I have a customer that I support that is in Chile and was
> told that the October 13 (which is a Sunday) is the day
> when DST comes into effect. With my discussions, it seems
> that Chile computer users do not make use of DST when
> setting their servers because they do not trust OS makers
> to record the correct date/time this will occur for there
> timezone.
>
> I set it for Santiago because I wanted to understand why
> they did not trust OS makers. Now I know, one day early,
> nice one.
>
> Following link indicates that Sunday is the day.
>
> http://www.timeanddate.com/worldclock/city.html?n=232
>
> This one appears to be clearer, they indicate Saturday at
> 24:00, which means at the end of Saturday or just 1 second
> before Sunday (if we assume their clocks go from 00:00:01
> to 24:00:00).
>
> http://www.mindspring.com/~gwil/tcl.html
>
> Why is Microsoft changing to DST one day early?
>
> Now maybe the misunderstanding is that in North America we
> view midnight as the start of the day (00:00:00 to
> 23:59:59). Others may view midnight as the end of the day
> (00:00:01 to 24:00:00). This is semantics. Most computer
> OS will work in the 00:00:00 to 23:59:59 way.
>
> Win2000 and WinXP both will change to DST 1 day early when
> Timezone is set to Santiago. I am reporting this as a
> fault in the timezone information. I don't live in
> Santiago so it doesn't affect me directly.
>
> Earl, do you have a link to this Decree, it would be
> interesting to read the entire text.
>
> Rocco Corsi
>
>

In the United States, the time change is at 2:00 AM to avoid the midnight
confusion. The Chilean article is pretty clear that DST begins on Saturday and
ends on Saturday. Your reasoning would have it beginning on Sunday.

Here is the link. I did not copy the Spanish portion.

http://webexhibits.org/daylightsaving/g.html

You can go back and forth through the other pages of the link by clicking on the
topics to the left. 

--
Earl F. Parrish

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