Drupal 6 & CCK field filling manually

If you should fill CCK field manually you must fill 'value' field and '_error_element' field. Otherwise data will not be accepted.

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1. /** 
2. * Implementation of hook_nodeapi(). 
3. */  
4. function custom_nodeapi(&$node, $op) {   
5.  switch ($op) {     
6.   case 'presave':  
7.    if ($node->type == 'order') {  
8.     $node->field_date_creation[0]['value'] = format_date(time());  
9.     $node->field_date_creation[0]['_error_element'] = 'field_date_creation][0][value';  
10.    }  
11.    break;  
12.  }  
13. }  

/**
* Implementation of hook_nodeapi().
*/
function custom_nodeapi(&$node, $op) { 
 switch ($op) {   
  case 'presave':
   if ($node->type == 'order') {
    $node->field_date_creation[0]['value'] = format_date(time());
    $node->field_date_creation[0]['_error_element'] = 'field_date_creation][0][value';
   }
   break;
 }
}