how to store datetime values to mysql table using php

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PHP

Hello i'm having a textbox [datetimepicker].
when we select it will show like a format dd/mm/yyyy hh:mm
eg: 24/04/2014 11:00
now i need to store this value to mysql table using php.
i'm having an attribute appointment which is in type 'datetime'
i tried but i did not solved.
i used the following code but it will not solved my problem

$papp=$_POST['papp'];
    $papp = date("Y-m-d h:i:s",  strtotime($papp));

it give a result like 1970-01-01 05:30:00

kindly solve my pblm..
thanks in advance