Got this working on php 5.3 

$datetime1 = new DateTime("2011-10-10 10:00:00");
$datetime2 = new DateTime("2011-10-10 10:45:00");
$interval = $datetime1->diff($datetime2);
$hours   = $interval->format('%h'); 
$minutes = $interval->format('%i');
echo 'Diff. in minutes is: '.($hours * 60 + $minutes);

How can i make it work on php 5.2 ? are there any equivalent functions available??

Got it working 

$date1 = "2011-10-10 10:00:00";
$date2 = "2011-10-10 10:11:00";
echo round((strtotime($date2) - strtotime($date1)) /60);
php datetime
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