|  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
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
 [2002-09-18 05:15 UTC] chrischtian at chrischtian dot com
  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.


Add a Patch

Pull Requests

Add a Pull Request


AllCommentsChangesGit/SVN commitsRelated reports
 [2002-09-18 05:23 UTC]
This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at
In case this was a documentation problem, the fix will show up soon at

In case this was a website problem, the change will show
up on the site and on the mirror sites in short time.
Thank you for the report, and for helping us make PHP better.
PHP Copyright © 2001-2018 The PHP Group
All rights reserved.
Last updated: Sun Nov 19 01:31:42 2017 UTC