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Bug #35219 error in date() - function
Submitted: 2005-11-14 19:01 UTC Modified: 2005-11-23 19:00 UTC
From: mail at harendt dot de Assigned: derick (profile)
Status: Not a bug Package: Date/time related
PHP Version: 4.4.1 OS: Linux infong 2.4 #1 SMP Thu Jan
Private report: No CVE-ID: None
View Developer Edit
 [2005-11-14 19:01 UTC] mail at harendt dot de 
Description:
------------
The function "date" called with the parameter "W" to give the number of the week is wrong when thr year turns.
For example the function give for sunday, 01.01.2006 the week number 52.

Reproduce code:
---------------
<?php
$Dez05 = mktime(0, 0, 0, 12, 28, 2005);

$aHour = 60*60; $aDay  = $aHour * 24;

for ($d = 0; $d <= 5; $d++) {
	$Day00 = $Dez05 + $d * $aDay;
	
	for ($ih = 0; $ih < 3; $ih++) {
    	$h=8*$ih;
    	$TS = $Day00 + $h * $aHour;
		$DAY = date("D",$TS); $nrDAY = date("d",$TS);
		$HR = date("H",$TS); $MIN = date("i",$TS);
		$MNTH = date("m",$TS); $YEAR = date("y",$TS);
		
		$WEEK = date("W",$TS); $WEEK = sprintf ("%02d", $WEEK);
    	$sd = sprintf ("%02d", $d);
    	$sh = sprintf ("%02d", $h);
    	
		echo "$TS ($sd, $sh) --> week = <b>$WEEK</b>, $DAY, $nrDAY.$MNTH.$YEAR,  		      $HR.$MIN </br>";
	}	
}
?>


Expected result:
----------------
1135724400 (00, 00) --> week = 52, Wed, 28.12.05, 00.00 
1135753200 (00, 08) --> week = 52, Wed, 28.12.05, 08.00 
1135782000 (00, 16) --> week = 52, Wed, 28.12.05, 16.00 
1135810800 (01, 00) --> week = 52, Thu, 29.12.05, 00.00 
1135839600 (01, 08) --> week = 52, Thu, 29.12.05, 08.00 
1135868400 (01, 16) --> week = 52, Thu, 29.12.05, 16.00 
1135897200 (02, 00) --> week = 52, Fri, 30.12.05, 00.00 
1135926000 (02, 08) --> week = 52, Fri, 30.12.05, 08.00 
1135954800 (02, 16) --> week = 52, Fri, 30.12.05, 16.00 
1135983600 (03, 00) --> week = 52, Sat, 31.12.05, 00.00 
1136012400 (03, 08) --> week = 52, Sat, 31.12.05, 08.00 
1136041200 (03, 16) --> week = 52, Sat, 31.12.05, 16.00 
1136070000 (04, 00) --> week = 52, Sun, 01.01.06, 00.00 !!
1136098800 (04, 08) --> week = 52, Sun, 01.01.06, 08.00 !!
1136127600 (04, 16) --> week = 52, Sun, 01.01.06, 16.00 !! 
1136156400 (05, 00) --> week = 01, Mon, 02.01.06, 00.00 
1136185200 (05, 08) --> week = 01, Mon, 02.01.06, 08.00 
1136214000 (05, 16) --> week = 01, Mon, 02.01.06, 16.00

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 [2005-11-14 19:56 UTC] tony2001@php.net 
Derick, take a look at it plz.
# date -d "2006-01-01 00:00:00" +"%W"
00
 [2005-11-17 13:13 UTC] derick@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

http://php.net/date, see the \"W\" modifier, which returns the ISO week of the year. There is nothing wrong here.
 [2005-11-17 13:27 UTC] tony2001@php.net 
Ok, this is what ISO says:
"In commercial and industrial applications (delivery times, production plans, etc.), especially in Europe, it is often required to refer to a week of a year. Week 01 of a year is per definition the first week that has the Thursday in this year, which is equivalent to the week that contains the fourth day of January. In other words, the first week of a new year is the week that has the majority of its days in the new year. Week 01 might also contain days from the previous year and the week before week 01 of a year is the last week (52 or 53) of the previous year even if it contains days from the new year. A week starts with Monday (day 1) and ends with Sunday (day 7)."
http://www.cl.cam.ac.uk/~mgk25/iso-time.html
 [2005-11-23 19:00 UTC] mail at harendt dot de 
...Week 01 of a year is per definition the first week that
has the Thursday in this year ...

Thank you very much for this helpful hint. And excuse my "bug report".
 
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