From date ignored when editing an existing node

When editing an existing node the from date is set to the to date at my installation (Drupal 5.1).
It seems like the value entry of the params array is never set to the from value in date_widget().

I added only one line to correct this (line 539):

            else {
              $params['label'] = t('From:');
              $params['field_name'] = 'value';
              $form[$field['field_name']][$delta] = date_text_input($params);
              $params['label'] = t('To:');
              $params['field_name'] = 'value2';
              $params['required'] = $field['todate'] == 'required'  && ($field['value'] || $field['required']) ? TRUE : FALSE;
              if (!$params['required'] && empty($delta['value2'])) $params['blank_default'] = 1;
              $params['value'] = $items[$delta]['value2']; // <- this on is new
              $form[$field['field_name']][$delta] += date_text_input($params);
              $form[$field['field_name']][$delta]['value2']['#weight'] += .1;
              $form[$field['field_name']][$delta]['#empty'] = empty($items[$delta]['value']) && empty($items[$delta]['value2']) ? TRUE : FALSE;
            }