Index: date_api_sql.inc
===================================================================
--- date_api_sql.inc	(revision 43)
+++ date_api_sql.inc	(working copy)
@@ -503,7 +503,8 @@
     else {
       $field = $this->sql_field($field, 0);
     }
-    return $this->sql_format($format, $field) ." $operator '$value'";
+
+    return "{$field} {$operator} '" . date("c", strtotime($value)) . "'";
   }
 
   /**