<?php
$date = '01/11/2000 12:30';
$champsDate = date_parse_from_format('d/m/Y H:i', $date);
$time = mktime($champsDate['hour'],
               $champsDate['minute'],
               $champsDate['second'],
               $champsDate['month'],
               $champsDate['day'],
               $champsDate['year']);
echo 'La chaîne ['.$date.'] convertie en seconde depuis Epoch puis'."\n".
     'en date lisible (format Français) donne: '.date('d/m/Y H:i:s', $time);
?>