--- theme/theme.inc.orig	2008-12-02 17:12:30.000000000 +0100
+++ theme/theme.inc	2008-12-02 17:13:45.000000000 +0100
@@ -312,7 +312,7 @@
       }
       // Find the next time slot and fill it. Populate the skipped
       // slots if the option to show empty times was chosen.
-      while ($time > $next_start_time && $time < $end_start_time) {
+      while ($time >= $next_start_time && $time < $end_start_time) {
         if ((!empty($show_empty_times)) && !array_key_exists($start_time, $grouped_items)) {
           $grouped_items[$start_time]['values'] = array();        
         }
@@ -401,7 +401,7 @@
       foreach ($items as $item) {
         // Find the next time slot and fill it. Populate the skipped
         // slots if the option to show empty times was chosen.
-        while ($time > $next_start_time && $time < $end_start_time) {
+        while ($time >= $next_start_time && $time < $end_start_time) {
           if (($show_empty_times) && !array_key_exists($start_time, $grouped_items)) {
             $grouped_items[$start_time]['values'][$weekno] = array();   
           }