Description:
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From manual page: http://www.php.net/book.datetime
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If a year is saved as a MySQL date without months or days being set - in the 
format yyyy-00-00 - when it's returned using DateTime the year before results. So 
2000-00-00 is returned with the value of the year set to 1999.

Test script:
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<?php  $date = '2000-00-00';
$date = new DateTime($date);
echo $date->format('Y'); ?>

Expected result:
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2000

Actual result:
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1999