Fix wrong timestamp generation when invalid archive dates are submitted, thanks to Deminy

index.php

@@ -145,6 +145,18 @@ if (preg_match(PAT_ARCHIVES, $uri, $matches) || isset($serendipity['GET']['range
         $serendipity['GET']['hidefooter'] = null;
     }
 
+    if (isset($year) && !is_numeric($year)) {
+        $year = date('Y');
+    }
+
+    if (isset($month) && !is_numeric($month)) {
+        $month = date('m');
+    }
+
+    if (isset($day) && !is_numeric($day)) {
+        $day = date('d');
+    }                
+
     switch($serendipity['calendar']) {
         case 'gregorian':
         default: