From:             salathe
Operating system: 
PHP version:      trunk-SVN-2011-09-13 (SVN)
Package:          Date/time related
Bug Type:         Bug
Bug description:DateTime "Unknown" day of week

Description:
------------
For lots of negative-year dates, the day of the week is reported as
"Unknown". 
Sundays (0th day) are okay. The most modern date affected appears to be
-0007-10-
01.

The test script below runs through each day in the year -10 as an example.

Test script:
---------------
<?php

$utc = new DateTimeZone('UTC');
$period = new DatePeriod(
    new DateTime('-0010-01-01', $utc),
    new DateInterval('P1D'),
    new DateTime('-0009-01-01', $utc)
);

foreach ($period as $date) {
    if ($date->format('D') === 'Unknown') {
        echo $date->format('Y-m-d D') . PHP_EOL;
    }
}

?>

Expected result:
----------------
No output is expected.

Actual result:
--------------
-0010-01-01 Unknown
-0010-01-02 Unknown
-0010-01-03 Unknown
-0010-01-04 Unknown
-0010-01-05 Unknown
-0010-02-01 Unknown
-0010-02-02 Unknown
-0010-03-01 Unknown
-0010-03-02 Unknown
-0010-05-01 Unknown
-0010-05-02 Unknown
-0010-05-03 Unknown
-0010-05-04 Unknown
-0010-06-01 Unknown
-0010-08-01 Unknown
-0010-08-02 Unknown
-0010-08-03 Unknown
-0010-10-01 Unknown
-0010-10-02 Unknown
-0010-10-03 Unknown
-0010-10-04 Unknown
-0010-10-05 Unknown
-0010-11-01 Unknown
-0010-11-02 Unknown

-- 
Edit bug report at https://bugs.php.net/bug.php?id=55687&edit=1
-- 
Try a snapshot (PHP 5.4):            
https://bugs.php.net/fix.php?id=55687&r=trysnapshot54
Try a snapshot (PHP 5.3):            
https://bugs.php.net/fix.php?id=55687&r=trysnapshot53
Try a snapshot (trunk):              
https://bugs.php.net/fix.php?id=55687&r=trysnapshottrunk
Fixed in SVN:                        
https://bugs.php.net/fix.php?id=55687&r=fixed
Fixed in SVN and need be documented: 
https://bugs.php.net/fix.php?id=55687&r=needdocs
Fixed in release:                    
https://bugs.php.net/fix.php?id=55687&r=alreadyfixed
Need backtrace:                      
https://bugs.php.net/fix.php?id=55687&r=needtrace
Need Reproduce Script:               
https://bugs.php.net/fix.php?id=55687&r=needscript
Try newer version:                   
https://bugs.php.net/fix.php?id=55687&r=oldversion
Not developer issue:                 
https://bugs.php.net/fix.php?id=55687&r=support
Expected behavior:                   
https://bugs.php.net/fix.php?id=55687&r=notwrong
Not enough info:                     
https://bugs.php.net/fix.php?id=55687&r=notenoughinfo
Submitted twice:                     
https://bugs.php.net/fix.php?id=55687&r=submittedtwice
register_globals:                    
https://bugs.php.net/fix.php?id=55687&r=globals
PHP 4 support discontinued:          
https://bugs.php.net/fix.php?id=55687&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=55687&r=dst
IIS Stability:                       
https://bugs.php.net/fix.php?id=55687&r=isapi
Install GNU Sed:                     
https://bugs.php.net/fix.php?id=55687&r=gnused
Floating point limitations:          
https://bugs.php.net/fix.php?id=55687&r=float
No Zend Extensions:                  
https://bugs.php.net/fix.php?id=55687&r=nozend
MySQL Configuration Error:           
https://bugs.php.net/fix.php?id=55687&r=mysqlcfg

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