$CreatDateTime=date('Y-m-d h:i:s A'); code example
Example 1: string to datetime php
$s = '06/10/2011 19:00:02';
$date = strtotime($s);
echo date('d/M/Y H:i:s', $date);
Example 2: change datetime format from Y-m-d h:i:s to d-m-Y in php
$old_date = date('l, F d y h:i:s'); // returns Saturday, January 30 10 02:06:34
$old_date_timestamp = strtotime($old_date);
$new_date = date('Y-m-d H:i:s', $old_date_timestamp);