--- office_hours.module	2009-06-26 16:40:56.000000000 -0500
+++ office_hoursNEW.module	2009-06-26 16:37:38.000000000 -0500
@@ -65,7 +65,7 @@ function office_hours_init () {
  * Implementation of hook_content_is_empty().
  */
 function office_hours_content_is_empty($item, $field) {
-  if ( $item['starthours'] == 0 || $item['endhours'] == 0 || !isset($item['day']) )  {
+  if ( $item['starthours'] == '' || $item['endhours'] == '' || !isset($item['day']) )  {
     return TRUE;
   }
   return FALSE;