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Bug #46970 date("W") returning wrong week number
Submitted: 2008-12-30 09:56 UTC Modified: 2008-12-30 12:22 UTC
From: supratiksekhar at gmail dot com Assigned:
Status: Not a bug Package: Calendar related
PHP Version: 5.2.8 OS: Windows
Private report: No CVE-ID: None
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From: supratiksekhar at gmail dot com
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 [2008-12-30 09:56 UTC] supratiksekhar at gmail dot com
I am using php-5.2.6 currently, while writing a function to get week number using date("W") I found that the value it is returning is wrong.
I searched for the solution and found that this is a bug [Bug #33957] in PHP which is already being solved. But when I try for the year 2008 it returns the wrong value. I tried with the latest version of PHP but the problem is still there.



Reproduce code:
$datestr = "2008-12-29  00:00:00";
$da = new DateTime($datestr);
$t = $da->format("U");
echo "Week number: " . date("W", $t);

Expected result:
Week number: 53

Actual result:
Week number: 01


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 [2008-12-30 10:36 UTC]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at and the instructions on how to report
a bug at

W displays the ISO week number, which is really 01 right now (of the ISO year 2009).
 [2008-12-30 12:00 UTC] supratiksekhar at gmail dot com
Thanks for your quick response, I downloaded the PHP Windows snapshot "Windows x86 VC9 (thread safe))" and checked with the date "Mon Dec 29, 2008". It returns the week number of year as "1" where I expect this to return as "53" in ISO standard.


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