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I used the below code for finding the difference in days for two dates : 

   1 $startDate = new Zend_Date('2010-02-28', 'YYYY-MM-dd');
   2 $lastDate  = new Zend_Date('2010-03-01', 'YYYY-MM-dd');
   3 $diff = $lastDate->sub($startDate)->toValue();
   4 $days = ceil($diff/60/60/24) +1;

The 3rd line in php shows me an error :

Expected an operand but found Refs:Zend Date -- day difference

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MoopanMec
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1 Answers1

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Use in 3rd line

$diff = $lastDate->sub($startDate)->toString(Zend_Date::DAY);

that solve your problem.