Bug #18532 Updated: date('W'...) returns wrong weeknumbers

ID: 18532 Updated by: georg@php.net Reported By: tmus@get2net.dk -Status: Open +Status: Bogus Bug Type: Date/time related Operating System: Linux / Windows XP PHP Version: 4.2.1 New Comment: date uses iso8601 standard which supports long years (53 weeks). the first week of the ISO calendar year can begin as late as 4 January and as early as 29 December of the previous year. Likewise, the last week of the ISO calendar year can end as early as 28 December and as late as 3 January of the following year. Previous Comments: ------------------------------------------------------------------------ [2002-07-24 05:07:50] tmus@get2net.dk There is a problem with the date('W'...) function in PHP 4.2.1... The ISO standard says that week 1 is the week that has the first thursday of the gregorian year, making the last week the week with the last thursday of the year (more/better info here http://www.merlyn.demon.co.uk/weekinfo.htm#WkNo ) But anyway, try making the following test... print date("r (W)",1041289200)."<br>\n"; // Tue, 31 Dec 2002 00:00:00 +0100 (53) print date("r (W)",1041375600)."<br>\n"; // Wed, 1 Jan 2003 00:00:00 +0100 (1) So any way You decide to put it, at least the same week should not have two different numbers depending on the timestamp. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=18532&edit=1