diff --git a/app_controller.php b/app_controller.php
index c081397..dc53904 100644
--- a/app_controller.php
+++ b/app_controller.php
@@ -952,7 +952,9 @@ class AppController extends Controller {
     foreach ($searches AS &$search) {
       if (preg_match('/(_date|stamp)$/', $search['field']) &&
 	  preg_match('%(\d{1,2})[-/](\d{1,2})[-/](\d{2,4})%', $search['value'], $matches)) {
-	$search['value'] = sprintf('%04d%02d%02d', $matches[3], $matches[2], $matches[1]);
+	$search['value'] = sprintf('%04d%02d%02d',
+				   $matches[3] + ($matches[3] < 50 ? 2000 : ($matches[3] < 100 ? 1900 : 0)),
+				   $matches[2], $matches[1]);
       }
     }
     unset($search);