YYYY is the ISO year, which is different from yyyy which is the normal
calendar year.
http://en.wikipedia.org/wiki/ISO_year#Relation_with_the_Gregorian_calendar

You should use either of the following:
$date = new Zend_Date($datecolumn, Zend_Date::ISO_8601);
$date = new Zend_Date($datecolumn, 'yyyy-MM-dd');

Cheers,
David
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