if not format dateTime php 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: date time format php

$today = date("F j, Y, g:i a");                 // March 10, 2001, 5:16 pm