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Request #65694 error calendar in year 2016, with function mktime()
Submitted: 2013-09-18 10:22 UTC Modified: 2013-09-18 10:56 UTC
From: philippe dot alcaina at hotmail dot fr Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 5.5.3 OS: windows linux
Private report: No CVE-ID: None
 [2013-09-18 10:22 UTC] philippe dot alcaina at hotmail dot fr
I'm a french developer computer.

For an internet tool I need to get a list of weeks after having selected one year and one month.

By testing I found a BUG in the year 2016.

PHP gives me:
1 January 2016 the number of week: 53 (instead of 1)
January 31, 2016 the number of week: 4 (instead of 5)

then the error shifts in other months.

The system works correctly in 2013, 2014, 2015.

Test script:
I provide you sample of the code that allows me to build this list of weeks, I particularly use mktime ()

// timestamp of first day of month
$time = mktime(0,0,0,$mois_select,1,$annee_select);
// number of days of month
$nbrJoursMois = intval(date('t',$time));
// the number of the first week
$numSemaineDebutMois = intval(date('W', $time));
// timestamp of end month
$timeFinMois = mktime(0,0,0,$mois_select,$nbrJoursMois,$annee_select);
// the number of the last week
$numSemaineFinMois = intval(date('W', $timeFinMois));

/**** Display results ****/

$annee_select = 2016
$mois_select = 1
$time = 1451602800
$nbrJoursMois = 31
$numSemaineDebutMois = 53  (Error)
$timeFinMois = 1454194800
$numSemaineFinMoisnum = 4   (Error)


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 [2013-09-18 10:56 UTC]
-Status: Open +Status: Not a bug
 [2013-09-18 10:56 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

This seems to work just fine. PHP uses the ISO8601 calendar which indeed has a week "2015-53" for the period Mon Dec 28, 2015 to Sun Jan 3, 2016. Please see for more information.
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