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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