Description:
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---
From manual page: http://www.php.net/datetime.construct
---
I'm actually using PHP 5.3.2. Apologies for not testing against 5.3.6.

DateTime objects created with any of the following strings result in incorrect years:
'January 0099' -> 1999
'January 1, 0099' -> 1999
'0099-01' -> 1999

However, all of the following work correctly:
'0099' -> 0099
'0099-01-01' -> 0099
'01-01-0099' -> 0099

I imagine this is due to DateTime parsing 0099 into 99 in the bad examples (and thus triggering the 1900 addition). This bug currently blocks the following MediaWiki bug: https://bugzilla.wikimedia.org/show_bug.cgi?id=28655

Test script:
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$tz = new DateTimeZone("Europe/Amsterdam");
$dateObject = new DateTime( 'January 0099', $tz );
echo $dateObject->format( 'Y' );
$dateObject = new DateTime( 'January 1, 0099', $tz );
echo $dateObject->format( 'Y' );
$dateObject = new DateTime( '0099-01', $tz );
echo $dateObject->format( 'Y' );

Expected result:
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0099
0099
0099

Actual result:
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1999
1999
1999