Re: Date question with weeknumber
Re: Date question with weeknumber
- Subject: Re: Date question with weeknumber
- From: "Nigel Garvey" <email@hidden>
- Date: Tue, 4 May 2010 08:51:28 +0100
Mark J. Reed wrote on Mon, 3 May 2010 19:04:17 -0400:
>On Mon, May 3, 2010 at 5:53 PM, Nigel Garvey
> -- In Snow Leopard, calculations using dates before
>> -- 1583 have been goodness-me'd by a shift to Julian dates before some
>> -- time in 1582.
>> set baseMonday to date "Monday 3 January 1583 00:00:00"
>>
>
>The first day of the Gregorian calendar, at least in those countries that
>adopted it immediately, was Friday, the 15th of October, 1582 (the previous
>day being Thursday the 4th according to the Julian calendar). So the first
>Gregorian Monday would be October 18th of that year. Of course, you could
>pick any Monday in the Julian calendar as well, but based on your comment
>above I infer that would not work on pre-SL systems.
Any Monday works pre-SL as well and the compiled script is transportable
between systems, but it was less inconvenient to use a 1583 date in my
original post than to explain that it had to be such-and-such a date on
one system and something else on all the others. With the base year I
used to use — 1000 — the "4th January" date has to be initialised like
this in SL:
set now to (current date)
-- Get a known 4th January.
set Jan4 to date "Saturday 30 December 0999 00:00:00"
-- Convert it to 4th January this year.
set Jan4's year to now's year
>I remain surprised the date of Julian/Gregorian conversion isn't
>locale-sensitive in Applescript, though.
I think it's pretty clueless implementing it anyway, given the potential
for wrecking date calculations, the unlikelihood of anyone wanting to
know Julian dates, and the fact that — as you say — the "date at the
time" is only going to be correct for a handful of locations anyway. It
would have been far better to have implemented a separate 'Julian date'
class with the necessary coercions and/or to have introduced a 'locale
date' class.
I suppose AppleScript dates might be deprecated altogether eventually in
favour of something slower.
NG _______________________________________________
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