[tz] Chilean Government annuounced new date for leaving and entering DST in 2012

Glenn Eychaner geychaner at lco.cl
Thu Mar 1 15:45:16 UTC 2012

On Mar 1, 2012, at 12:29 PM, Robert Elz wrote:

>    Date:        Thu, 1 Mar 2012 10:43:30 -0300
>    From:        Glenn Eychaner <geychaner at lco.cl>
>    Message-ID:  <A4A12180-EBB2-4FB9-B587-86A5EF6CAFEC at lco.cl>
>  | The 2011n update I downloaded doesn't contain any of the post-2000
>  | Chile changes.
> No, I meant the 2012a update, a preliminary (for this list) patch for
> which was sent out earlier this week.

Sorry.  I didn't notice before that you had included the Antarctica changes (from 2000 onward) in the patch; when I realized I had as usual forgotten about Antarctica, I created exactly the same patch based on the 2011n release.  :-)

> That data was already there, as best I can tell, just the same as you
> have it (except we have the 2012 April transition encoded as "Apr Sun>=23"
> (last Sunday in April) rather than the "Apr 29" you have (which is, of
> course, the same thing).

Incidentally, a style question: why use the "Apr Sun >= 23" notation for changes that affect only a single year, rather than just specifying the exact date (e.g. "Apr 29"), especially when the government rule in question apparently specifies the exact date anyway?  For changes that affect only a single year, the exact date seems more clear and concise, so you don't have to look up the actual date of the change later.  (This has probably been discussed before and I missed it.)

Glenn Eychaner (geychaner at lco.cl)
Telescope Systems Programmer, Las Campanas Observatory

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