DTSTART = current date instead of cck start date

I'm trying to get an ical view working but as result for DTSTART and DTEND I get the current date, without time:

DTSTAMP:20110301T125741Z

DTSTART:20110301Z

DTEND:20110301Z

1298970999

Any ideas? I use, Calendar 6.x-2.4, Date 6.x-2.7, Views 6.x-2.12.

The query looks like this:

SELECT node.nid AS nid,
   node.title AS node_title,
   node_revisions.teaser AS node_revisions_teaser,
   node_revisions.format AS node_revisions_format,
   node_data_field_datum.field_datum_value AS node_data_field_datum_field_datum_value,
   node_data_field_datum.field_datum_value2 AS node_data_field_datum_field_datum_value2,
   node.type AS node_type,
   node.vid AS node_vid,
   node.changed AS node_changed
 FROM node node 
 LEFT JOIN node_revisions node_revisions ON node.vid = node_revisions.vid
 LEFT JOIN content_type_activiteit node_data_field_datum ON node.vid = node_data_field_datum.vid
 WHERE ((node.status <> 0) AND (node.nid = 18))
    AND (DATE_FORMAT(ADDTIME(FROM_UNIXTIME(node.changed), SEC_TO_TIME(3600)), '%Y-%m-%d') >= '2008-01-01')
   ORDER BY node_changed ASC
</>

The export of the relevant part of the view:
<code>
$handler->override_option('style_plugin', 'ical');
$handler->override_option('style_options', array(
  'mission_description' => FALSE,
  'description' => '',
  'summary_field' => 'title',
  'description_field' => 'teaser',
  'location_field' => '',
));
$handler->override_option('row_plugin', '');
$handler->override_option('path', 'ical');
$handler->override_option('menu', array(
  'type' => 'none',
  'title' => '',
  'description' => '',
  'weight' => 0,
  'name' => 'navigation',
));
$handler->override_option('tab_options', array(
  'type' => 'none',
  'title' => '',
  'description' => '',
  'weight' => 0,
  'name' => 'navigation',
));
$handler->override_option('displays', array(
  'default' => 0,
  'calendar_1' => 0,
  'calendar_block_1' => 0,
  'block_1' => 0,
  'block_2' => 0,
));
$handler->override_option('sitename_title', FALSE);
$handler = $view->new_display('block', 'Upcoming', 'block_1');
$handler->override_option('fields', array(
  'title' => array(
    'label' => '',
    'link_to_node' => 1,
    'exclude' => 0,
    'id' => 'title',
    'field' => 'title',
    'table' => 'node',
    'relationship' => 'none',
    'format' => 'default',
  ),
  'field_datum_value' => array(
    'label' => '',
    'alter' => array(
      'alter_text' => 0,
      'text' => '',
      'make_link' => 0,
      'path' => '',
      'link_class' => '',
      'alt' => '',
      'prefix' => '',
      'suffix' => '',
      'target' => '',
      'help' => '',
      'trim' => 0,
      'max_length' => '',
      'word_boundary' => 1,
      'ellipsis' => 1,
      'html' => 0,
      'strip_tags' => 0,
    ),
    'empty' => '',
    'hide_empty' => 0,
    'empty_zero' => 0,
    'link_to_node' => 0,
    'label_type' => 'none',
    'format' => 'long',
    'multiple' => array(
      'multiple_number' => '',
      'multiple_from' => '',
      'multiple_to' => '',
      'group' => '',
    ),
    'repeat' => array(
      'show_repeat_rule' => '',
    ),
    'fromto' => array(
      'fromto' => 'both',
    ),
    'exclude' => 0,
    'id' => 'field_datum_value',
    'table' => 'node_data_field_datum',
    'field' => 'field_datum_value',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
));
$handler->override_option('sorts', array(
  'changed' => array(
    'order' => 'ASC',
    'granularity' => 'minute',
    'delta' => '-1',
    'id' => 'changed',
    'table' => 'node',
    'field' => 'changed',
    'relationship' => 'none',
    'override' => array(
      'button' => 'Use default',
    ),
  ),
));
$handler->override_option('arguments', array());
$handler->override_option('filters', array(
  'status' => array(
    'operator' => '=',
    'value' => 1,
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'status',
    'table' => 'node',
    'field' => 'status',
    'relationship' => 'none',
  ),
  'date_filter' => array(
    'operator' => '>=',
    'value' => array(
      'min' => NULL,
      'max' => NULL,
      'value' => NULL,
      'default_date' => 'now',
      'default_to_date' => '',
    ),
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'date_fields' => array(
      'node_data_field_datum.field_datum_value' => 'node_data_field_datum.field_datum_value',
    ),
    'date_method' => 'OR',
    'granularity' => 'hour',
    'form_type' => 'date_select',
    'default_date' => 'now',
    'default_to_date' => '',
    'year_range' => '-3:+3',
    'id' => 'date_filter',
    'table' => 'node',
    'field' => 'date_filter',
    'override' => array(
      'button' => 'Use default',
    ),
    'relationship' => 'none',
  ),
));

Thank you very much for helping