Hi proelgiz,
Yes you can do what you want using a custom template.
All you need to do is have an End date, and a Free text field. Then in the template, compare the dates to control the Free Text Field.
$sEndDate = $cck->getValue('newenddate');
$sEndDate = strtotime($sEndDate);
$sNow = strtotime("now");
if ($sNow < $sEndDate){
echo $cck->renderField('new');
}
Hope that helps,
Randy