Re: Santiago Time Zone DST information is incorrect for XP

From: Rocco Corsi (rocco.corsi@sympatico.ca)
Date: 10/01/02 

From: "Rocco Corsi" <rocco.corsi@sympatico.ca>
Date: Mon, 30 Sep 2002 17:19:01 -0700

>-----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

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