RE: Problems with date() - SOLVED

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Hi Ducarom

Thanks, that clarifies the issue perfectly. Changing to 28 December now
reliably gives the last week number of the year every time.

Cheers
Arno

-----Original Message-----
From: Ducarom [mailto:ducarom@xxxxxxxxx]
Sent: 13 September 2006 09:23
To: arno@xxxxxxxxxxxxxx
Cc: php-general@xxxxxxxxxxxxx
Subject: Re:  Problems with date()


Hi,

Try it with 28 December instead of 31 December.

>From http://en.wikipedia.org/wiki/ISO_week_date

The last week of the ISO year is the week before week 01; in accordance with
the symmetry of the definition, equivalent definitions are:

   - the week with the year's last Thursday in it
   - the week with December 28 in it
   - the last week with the majority (four or more) of its days in the
   ending year
   - the week starting with the Monday in the period 22 - 28 December
   - the week with the Thursday in the period 25 - 31 December
   - the week ending with the Sunday in the period 28 December - 3
   January
   - If 31 December is on a Monday, Tuesday, or Wednesday, it is in week
   01, otherwise in week 52 or 53.

Best Regards,
Ducarom

On 9/13/06, Arno Kuhl <akuhl@xxxxxxxxxxxx> wrote:
>
> I hope someone can help with this.
>
> I'm trying to find the week number of the last week of the year.
> I have the following code snippet:
>
> $lastday = strtotime("31 December ".$year);
> $lastdate = date("Y-m-d", $lastday);  // for testing
> $lastweek = date(W, $lastday);
>
> I put the $lastdate line in because I was convinced that $lastday must be
> wrong, but it's correct!
>
> When $year is 2000 I get an expected $lastweek of 52.
> When $year is 2001, 2002, or 2003 the $lastweek is 01!
> When $year is 2004 $lastweek is 53.
> When $year is 2005 $lastweek is 52.
>
> I haven't checked further than 2005.
>
> Why do I get the weird lastweek values for 2001, 2002, and 2003?
> I'm using PHP 4.3.4 on Win2000.
>
> Arno

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