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Bug #19470 date('W') - not ISO 8601
Submitted: 2002-09-18 05:15 UTC Modified: 2002-09-18 05:23 UTC
From: chrischtian at chrischtian dot com Assigned:
Status: Closed Package: Date/time related
PHP Version: 4.2.2 OS: Linux, Windows
Private report: No CVE-ID: None
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 [2002-09-18 05:15 UTC] chrischtian at chrischtian dot com 
<?php
  print date('W', strtotime('20050101')); //prints '0'
  print date('W', strtotime('20023112')); //53 instead of 1
?>

ISO-8601 weeks always start on Mondays. The first week is the first week with 4 or more days in January.
Don't know why the first example returns 0.. However it seems to me that date('W') just takes the first of January as the starting day for the week-count.

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 [2002-09-18 05:23 UTC] georg@php.net 
This bug has been fixed in CVS.

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