From:             glavic at gmail dot com
Operating system: ALL
PHP version:      Irrelevant
Package:          Date/time related
Bug Type:         Bug
Bug description:DateTime::format('W') returns wrong week number

Description:
------------
DateTime::format('W') returns wrong week number when date is 2013-12-30 or
2013-12-31.

Test script:
---------------
<?php
$dt = new DateTime;
for ($w = 52; $w <= 54; $w++) {
        $dt->setISODate(2013, $w);
        print_r($dt);
        echo $dt->format('Y W') . "\n\n";
}

# see this script running on all php versions http://3v4l.org/9aua5

Expected result:
----------------
DateTime Object
(
    [date] => 2013-12-23 11:02:12
    [timezone_type] => 3
    [timezone] => UTC
)
2013 52

DateTime Object
(
    [date] => 2013-12-30 11:02:12
    [timezone_type] => 3
    [timezone] => UTC
)
2014 01 # or 2013 53, but surely not 2013 01 !!!

DateTime Object
(
    [date] => 2014-01-06 11:02:12
    [timezone_type] => 3
    [timezone] => UTC
)
2014 02



Actual result:
--------------
DateTime Object
(
    [date] => 2013-12-23 11:02:12
    [timezone_type] => 3
    [timezone] => UTC
)
2013 52

DateTime Object
(
    [date] => 2013-12-30 11:02:12
    [timezone_type] => 3
    [timezone] => UTC
)
2013 01

DateTime Object
(
    [date] => 2014-01-06 11:02:12
    [timezone_type] => 3
    [timezone] => UTC
)
2014 02



-- 
Edit bug report at https://bugs.php.net/bug.php?id=65730&edit=1
-- 
Try a snapshot (PHP 5.4):   
https://bugs.php.net/fix.php?id=65730&r=trysnapshot54
Try a snapshot (PHP 5.3):   
https://bugs.php.net/fix.php?id=65730&r=trysnapshot53
Try a snapshot (trunk):     
https://bugs.php.net/fix.php?id=65730&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=65730&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=65730&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=65730&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=65730&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=65730&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=65730&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=65730&r=notwrong
Not enough info:            
https://bugs.php.net/fix.php?id=65730&r=notenoughinfo
Submitted twice:            
https://bugs.php.net/fix.php?id=65730&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=65730&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=65730&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=65730&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=65730&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=65730&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=65730&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=65730&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=65730&r=mysqlcfg

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