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Bug #50105 strtotime, strftime, weekday & monday & year leap
Submitted: 2009-11-06 21:12 UTC Modified: 2009-11-06 21:39 UTC
From: tcheko at no-log dot org Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 5.3.0 OS: Linux
Private report: No CVE-ID: None
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From: tcheko at no-log dot org
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 [2009-11-06 21:12 UTC] tcheko at no-log dot org 
Description:
------------
This code fails on two weeks. Week 1, year printed is 2009 instead of dec 29 2008 and week 52, year printed is 2009 instead of Jan 3 2010.

Bug or feature or am I doing something wrong ?
 

Reproduce code:
---------------
setlocale(LC_ALL, "fr_FR.utf8");
date_default_timezone_set("Europe/Paris");

// Get the number of weeks in a year
$weeks = date("W", mktime(0,0,0,12,31, 2009));
// print the 1st monday of each week with year
for($i=1; $i <= $weeks; $i++)
{
	if(strlen($i) == 1) $w = "0" . $i; else $w = $i;
	echo strftime("%A %e %B %G", strtotime("2009W$w")) . " - " .strftime("%A %e %B %G", strtotime("2009W$w +6days"));
}



Expected result:
----------------
lundi 28 d?cembre 2008 instead of lundi 28 d?cembre 2009

dimanche 3 janvier 2010 instead of dimanche 3 janvier 2009


Actual result:
--------------
Actual code output. Submitted code stripped to revelant part only.

Semaine n?1 du lundi 29 d?cembre 2009 au dimanche 4 janvier 2009
Semaine n?53 du lundi 28 d?cembre 2009 au dimanche 3 janvier 2009

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 [2009-11-06 21:39 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

You're doing it wrong, please read:

       %G     The ISO 8601 week-based year (see NOTES) with century as a deci&#8208;
              mal number.  The 4-digit year corresponding to the ISO week num&#8208;
              ber  (see %V).  This has the same format and value as %Y, except
              that if the ISO week number belongs  to  the  previous  or  next
              year, that year is used instead. (TZ)

NOTES
   ISO 8601 Week Dates
       %G, %g, and %V yield values calculated from the week-based year defined
       by the ISO 8601 standard.  In this system, weeks start on a Monday, and
       are numbered from 01, for the first week, up to 52 or 53, for the  last
       week.  Week 1 is the first week where four or more days fall within the
       new year (or, synonymously, week 01 is: the first week of the year that
       contains  a  Thursday;  or,  the  week that has 4 January in it).  When
       three of fewer days of the first calendar week of  the  new  year  fall
       within that year, then the ISO 8601 week-based system counts those days
       as part of week 53 of the preceding year.  For example, 1 January  2010
       is a Friday, meaning that just three days of that calendar week fall in
       2010.  Thus, the ISO 8601 week-based system considers these days to  be
       part  of  week 53 (%V) of the year 2009 (%G) ; week 01 of ISO 8601 year
       2010 starts on Thursday, 4 January 2010.
 
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