It is quite easy. Assuming you have a field(dateposted) with the type "timestamp" in your database table already queried and you want to display it, have it formated and also have the AM/PM, all you need do is shown below.
<?php
echo date("F j, Y h:m:s A" ,strtotime($row_rshearing['dateposted']));
?>
Note: Your OUTPUT should look some what like this depending on the date posted
May 21, 2014 03:05:27 PM