Hi Optic Blaze,
I have found the problem. It wasn'd the datatepicker. There was a problem with misspelling in an other field.
I had copied the code from a different page without a datepicker.

Thanks a lot..

Regards Andy

Hi there,

Good to hear. I worked on the code... mine looks a bit different...but i checked it and it works:

<?php
class Termin extends DataObject {
static $db = array(
'FirstDate' => 'Date',
'DateRange' => 'Varchar',
'Description' => 'HTMLVarchar'
);

function getCMSFields() {

$fields = new FieldList(
$dateField = new DateField('FirstDate', 'FirstDate'),
new HTMLEditorField('Description','Beschreibung'),
new TextField('DateRange','Termin')
);
$dateField->setConfig('showcalendar', true);
$dateField->setConfig('dateformat','dd-MM-yyyy');

return $fields;
}
}