add two date using datetime php class -

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i need add 30 days 2014-03-06.

i've done below code:-

$due_dt = new datetime("2014-03-06"); $act_dt = $due_dt->add("+30 days");

this code giving below error:-

message: datetime::add() expects parameter 1 dateinterval, string given

any please...

use datetime::modify 

$date = new datetime('2014-03-06'); $date->modify('+30 days'); echo $date->format('y-m-d');

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