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$datum = "01.08.03 - 11:02:43";

//Timestamp aus Datum
$a_datum = explode (" - ", $datum);
$a_date = explode (".", $a_datum[0]);
$a_time = explode (":", $a_datum[1]);

$datum = mktime ($a_time[0], $a_time[1], $a_time[2],
$a_date[1], $a_date[0], $a_date[2]);