Stuff

function event_all_day_nodeapi(&$node, $op, $teaser = NULL, $page = NULL) {
  // make sure it's an event enabled node
  if(variable_get('event_nodeapi_'. $node->type, 'never') != 'never') {
    switch ($op) {
      case 'view':
        $node->event['allday'] = event_all_day($node);
    }
  }
}