Re: [PERL] Skuffet over "Perl Cookbook"

[Christian Hansen <sslug@sslug>]

Peter Makholm wrote:

> Christian Hansen <sslug@sslug> writes:
>
>
> > ($YEARDAY) = (localtime)[7]
> > $WEEKNUM = int($YEARDAY/7) +1;
> >
> > I følge ovenstående bør første dag på året altid være en mandag, og
>
>
> Hint: Hvad tror du "int" gør

Det samme som int altid gør vel!

> Hint2: Hvordan tror du de numererer uger i Usa?

Vel på samme måde som i Europa, i hvert fald hvis de følger iso 
standarden, som kan læses her: http://www.cl.cam.ac.uk/~mgk25/iso-time.html

Der står blandt andet følgende:

In commercial and industrial applications (delivery times, production 
plans, etc.), especially in Europe, it is often required to refer to a 
week of a year. Week 01 of a year is per definition the first week that 
has the Thursday in this year, which is equivalent to the week that 
contains the fourth day of January. In other words, the first week of a 
new year is the week that has the majority of its days in the new year. 
Week 01 might also contain days from the previous year and the week 
before week 01 of a year is the last week (52 or 53) of the previous 
year even if it contains days from the new year. A week starts with 
Monday (day 1) and ends with Sunday (day 7).

Spændende læsning og måske værd at vide, hvis man har brug for ugenumre 
og kalenderberegninger, som mange har.


Christian