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        by Guna[ Edit ] 2012-07-23 14:55:46 
         
        
        	Below snippet will lets you to find number of days between two dates. It uses strtotime() function for this purpose.
function dateDiff($start, $end) {
			$start_ts = strtotime($start);
			$end_ts = strtotime($end);
			$diff = $end_ts - $start_ts;
			return round($diff / 86400);
}
echo dateDiff("10-3-2011","29-3-2012");