Yeah Zapa, that's what he's looking for...
$variable = strtotime(0000-00-00 00:00:00);
Will work just fine....
Example...
$starttime = strtotime("2004-07-04 06:00:00");
echo $starttime;
// Outputs: 1088935200
You can then use that UNIX timestamp and convert it to whatever using the date function:
$endresult = date("l, F jS, Y g:i:s A", $starttime);
echo $endresult;
// Outputs: Sunday, July 4th, 2004 6:00:00 AM