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<?php $date=date_create("2013-03-15"); echo "date =>" . date_format($date,"Y-m-d"); echo " ******** "; $date1= clone $date; date_add($date1,date_interval_create_from_date_string("40 days")); echo "date after modify date1 =>" . date_format($date1,"Y-m-d"); ?>

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