Datum
0000-00-00 00:00:00

<?php
function timeLeft($datum = '') {
  if(!ereg('^[0-9]{1,2}.[0-9]{1,2}.[0-9]{4}$', $datum)) {
    return('Falsches Format.');
  }
  $split  = explode('.', $datum);
  $handle = round((((mktime(0, 0, 0, $split[1], $split[0], $split[2])-time())/60)/60)/24);
  if($handle == 1) {
    return('<font color="#aa0000">'.$handle.'</font>');
  } elseif($handle == 0) {
    return('<font color="#ff0000"><strong>HEUTE</strong></font>');
  } else {
    return($handle);
  }
}

echo(timeLeft('25.2.1987').'<br />');
echo(timeLeft('25.1.2006').'<br />');
echo(timeLeft('6.2.2006').'<br />');
echo(timeLeft('7.2.2006').'<br />');
echo(timeLeft('8.2.2006').'<br />');
echo(timeLeft('20.2.2006').'<br />');
echo(timeLeft('stfuken').'<br />');
?>