<?php
$schedule = '31/03/2011 01:22 pm';
// %Y, %m and %d correspond to date()'s Y m and d.
// %I corresponds to H, %M to i and %p to a
$ugly = strptime($schedule, '%d/%m/%Y %I:%M %p');
$ymd = sprintf(
// This is a format string that takes six total decimal
// arguments, then left-pads them with zeros to either
// 4 or 2 characters, as needed
'%04d-%02d-%02d %02d:%02d:%02d',
$ugly['tm_year'] + 1900, // This will be "111", so we need to add 1900.
$ugly['tm_mon'] + 1, // This will be the month minus one, so we add one.
$ugly['tm_mday'],
$ugly['tm_hour'],
$ugly['tm_min'],
$ugly['tm_sec']
);
echo $ymd;
$new_schedule = new DateTime($ymd);
echo $new_schedule->format('Y-m-d H:i:s');
?>