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Bug #68495 Weekday calculated incorrectly using $weekDay = date('N', strtotime($date));
Submitted: 2014-11-25 06:25 UTC Modified: 2014-11-25 08:36 UTC
From: 8f181bd2 at opayq dot com Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 5.5Git-2014-11-25 (Git) OS: Windows
Private report: No CVE-ID: None
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 [2014-11-25 06:25 UTC] 8f181bd2 at opayq dot com 
Description:
------------
Weekday calculated incorrectly for dates in the far future, using $weekDay = date('N', strtotime($date));

Test script:
---------------
	function getWeekday($date)
	{
		$dateTime = \DateTime::createFromFormat('m/d/Y', $date);
		$date = date_format($dateTime, 'm/d/Y');
		
		$weekDay = date('N', strtotime($date));
		return $weekDay;
	}

	$arr = ['01/04/2050' => 'Sun',
		'01/09/2050' => 'Tues',
		'07/04/2050' => 'Mon',
		'04/06/2014' => 'Sun',
		'10/22/2014' => 'Wed',
		'10/25/2014' => 'Sat',
		'11/23/2014' => 'Sun'];

	foreach($arr as $date => $shouldBe)
	{
		echo $date.' is on weekday '.getWeekday($date).' - This should be '.$shouldBe.'<br/>';
	}

Expected result:
----------------
01/04/2050 is on weekday 0 - This should be Sun
01/09/2050 is on weekday 2 - This should be Tues
07/04/2050 is on weekday 1 - This should be Mon
04/06/2014 is on weekday 7 - This should be Sun
10/22/2014 is on weekday 3 - This should be Wed
10/25/2014 is on weekday 6 - This should be Sat
11/23/2014 is on weekday 7 - This should be Sun

Actual result:
--------------
01/04/2050 is on weekday 4 - This should be Sun
01/09/2050 is on weekday 4 - This should be Tues
07/04/2050 is on weekday 4 - This should be Mon
04/06/2014 is on weekday 7 - This should be Sun
10/22/2014 is on weekday 3 - This should be Wed
10/25/2014 is on weekday 6 - This should be Sat
11/23/2014 is on weekday 7 - This should be Sun

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 [2014-11-25 06:39 UTC] 8f181bd2 at opayq dot com
-: chanceofwonder at gmx dot com +: 8f181bd2 at opayq dot com -Summary: Weekday calculated incorrectly using $weekDay = date('N', strtotime($date)); +Summary: Exact PHP version
 [2014-11-25 06:39 UTC] 8f181bd2 at opayq dot com 
Exact PHP version is 5.5.11 (built: Apr  8 2014 15:07:14)
 [2014-11-25 06:40 UTC] 8f181bd2 at opayq dot com
-Summary: Exact PHP version +Summary: Weekday calculated incorrectly using $weekDay = date('N', strtotime($date));
 [2014-11-25 06:40 UTC] 8f181bd2 at opayq dot com 
(edited title)
 [2014-11-25 08:36 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2014-11-25 08:36 UTC] requinix@php.net 
Congratulations, you've discovered the limitations of using 32-bit integers for timestamps.
http://en.wikipedia.org/wiki/Year_2038_problem

Unfortunately 64-bit builds for PHP on Windows are currently experimental so there is only one good solution: use just the DateTime family of classes for dealing with dates in the far future, as they do not have the problem that haunts the "normal" functions like strtotime() and date().
 
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