diff -u b/plugins/FeedsParser.inc b/plugins/FeedsParser.inc
--- b/plugins/FeedsParser.inc
+++ b/plugins/FeedsParser.inc
@@ -616,7 +616,11 @@
 
     // Create and set time zone separately, PHP 5.2.6 does not respect time zone
     // argument in __construct().
-    parent::__construct($time, $tz);
+    parent::__construct($time);
+
+    // PHP < 5.3.6 has a bug when passing null to DateTime constructor.
+    $tz = $tz ? $tz : new DateTimeZone('UTC');
+    $this->setTimezone($tz);
 
     // Finally, set granularity.
     $this->setGranularityFromTime($time, $tz);