[tz] [PATCH] Updates for Chile 2013

[Deborah Goldsmith]

> This makes sense, I didn’t notice that the 2012 rule actually applies.

I also agree with extending the 2012 rule indefinitely.

Deborah

On Feb 21, 2013, at 4:12 AM, Petr Machata <pmachata at redhat.com> wrote:

> Robert Elz <kre at munnari.OZ.AU> writes:
> 
>>    Date:        Wed, 20 Feb 2013 22:55:04 +0100
>>    From:        Petr Machata <pmachata at redhat.com>
>>    Message-ID:  <m2ehgaljwl.fsf at redhat.com>
>> 
>>  | I decided to apply the transition dates to single years only--the DST
>>  | policy is reevaluated every year anyway.
>> 
>> I think that's a mistake - you're guaranteeing that the data is going
>> to be wrong, rather than simply making it likely.
>> 
>> I'd suggest that the data be changed as ...
>> 
>> --- southamerica.was	2012-07-25 21:13:46.000000000 +0700
>> +++ southamerica	2013-02-21 07:37:16.000000000 +0700
>> @@ -1277,10 +1277,8 @@
>> Rule	Chile	2010	only	-	Apr	Sun>=1	3:00u	0	-
>> Rule	Chile	2011	only	-	May	Sun>=2	3:00u	0	-
>> Rule	Chile	2011	only	-	Aug	Sun>=16	4:00u	1:00	S
>> -Rule	Chile	2012	only	-	Apr	Sun>=23	3:00u	0	-
>> -Rule	Chile	2012	only	-	Sep	Sun>=2	4:00u	1:00	S
>> -Rule	Chile	2013	max	-	Mar	Sun>=9	3:00u	0	-
>> -Rule	Chile	2013	max	-	Oct	Sun>=9	4:00u	1:00	S
>> +Rule	Chile	2012	max	-	Apr	Sun>=23	3:00u	0	-
>> +Rule	Chile	2012	max	-	Sep	Sun>=2	4:00u	1:00	S
>> # IATA SSIM anomalies: (1992-02) says 1992-03-14;
>> # (1996-09) says 1998-03-08.  Ignore these.
>> # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
>> 
>> That is, it turns out that the rules we inserted for 2012 apply for 2013
>> as well (except we were conservative last year, and assumed the change then
>> was just a one year thing, and put the older dates back for 2013).
>> 
>> So, the patch above just assumes that the 2012/2013 strategy will continue
>> forwards, which it might ... it is also possible that it won't, and we will
>> need to change it again next year (or even again later this year) but
>> some kind of reasonable guess is better than simply assuming that summer time
>> is going to start next September, and then never end.
> 
> This makes sense, I didn't notice that the 2012 rule actually applies.
> 
> Thanks,
> PM
>