diff --git date/date_views/includes/date_views_filter_handler_simple.inc date/date_views/includes/date_views_filter_handler_simple.inc
index 8a46253..c8e3cd5 100644
--- date/date_views/includes/date_views_filter_handler_simple.inc
+++ date/date_views/includes/date_views_filter_handler_simple.inc
@@ -90,9 +90,14 @@ class date_views_filter_handler_simple extends views_handler_filter_date {
       if (empty($this->options['exposed'])) {
         return str_replace(' ', 'T', $this->date_default_value($prefix));
       }
-      elseif (isset($this->options['expose']['identifier']) && !isset($_GET[$this->options['expose']['identifier']])) {
+      elseif (isset($this->options['expose']['identifier']) && !isset($_REQUEST[$this->options['expose']['identifier']])) {
         return str_replace(' ', 'T', $this->date_default_value($prefix));
       }
+      elseif ($this->options['is_grouped'] && isset($_REQUEST[$this->options['expose']['identifier']])) {
+        $identifier = $_REQUEST[$this->options['expose']['identifier']];
+        $options = $this->options['group_info']['group_items'][$identifier][$prefix][$prefix . '_group'];
+        return str_replace(' ', 'T', $this->date_default_value($prefix, $options));
+      }
     }
 
     return str_replace(' ', 'T', $input);