Index: monthgroup.inc
===================================================================
--- monthgroup.inc	(revision 115)
+++ monthgroup.inc	(working copy)
@@ -28,7 +28,7 @@
   } // if the sort field isn't set
 
   $by_month = array();
-  include_once(drupal_get_path('module', 'date_api') .'/date.inc');
+  include_once(drupal_get_path('module', 'date_api') .'/date_api_elements.inc');
   foreach ($nodes as $proto_node) {
     $node = node_load($proto_node->nid);
     $val = $node->$sort_field;
@@ -37,8 +37,8 @@
     // format_date doesn't handle pre-1970 dates, so we'll use date_format_date
     // in that case.  But both of these provide translation.
     if (function_exists('date_format_date')) {
-      $year = date_format_date('Y', strtotime($val));
-      $month = date_format_date('F', strtotime($val));
+      $year = date_format_date(date_make_date($val), 'custom', 'Y');
+      $month = date_format_date(date_make_date($val), 'custom', 'F');
     } else {
       $year  = format_date(strtotime($val), 'custom', 'Y', 0);
       $month = format_date(strtotime($val), 'custom', 'F', 0);