[fw-general] Difference between days using zend

[nisanth]

Hi All,
I have the below line of codes 

    $day1 = new Zend_Date('2010-03-01', 'YYYY-mm-dd');
    $day2 = new Zend_Date('2010-03-05', 'YYYY-mm-dd');
    $dateDiff = $day2->getDate()->get(Zend_Date::TIMESTAMP) -
$day1->getDate()->get(Zend_Date::TIMESTAMP);
    $days = floor((($dateDiff / 60) / 60) / 24);
    return  $days;  

this will return 4

But if gave 

    $day1 = new Zend_Date('2010-02-28', 'YYYY-mm-dd');
    $day2 = new Zend_Date('2010-03-01', 'YYYY-mm-dd');
    $dateDiff = $day2->getDate()->get(Zend_Date::TIMESTAMP) -
$day1->getDate()->get(Zend_Date::TIMESTAMP);
    $days = floor((($dateDiff / 60) / 60) / 24);
    return  $days; 

it will return -27 .. how will i get right answer
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