diff --git a/wp-includes/class-IXR.php b/wp-includes/class-IXR.php
index b2b5c2c0f..f18da1dd0 100644
--- a/wp-includes/class-IXR.php
+++ b/wp-includes/class-IXR.php
@@ -602,6 +602,7 @@ class IXR_Date {
     var $hour;
     var $minute;
     var $second;
+    var $timezone;
     function IXR_Date($time) {
         // $time can be a PHP timestamp or an ISO one
         if (is_numeric($time)) {
@@ -620,14 +621,15 @@ class IXR_Date {
     }
     function parseIso($iso) {
         $this->year = substr($iso, 0, 4);
-        $this->month = substr($iso, 4, 2); 
+        $this->month = substr($iso, 4, 2);
         $this->day = substr($iso, 6, 2);
         $this->hour = substr($iso, 9, 2);
         $this->minute = substr($iso, 12, 2);
         $this->second = substr($iso, 15, 2);
+        $this->timezone = substr($iso, 17);
     }
     function getIso() {
-        return $this->year.$this->month.$this->day.'T'.$this->hour.':'.$this->minute.':'.$this->second;
+        return $this->year.$this->month.$this->day.'T'.$this->hour.':'.$this->minute.':'.$this->second.$this->timezone;
     }
     function getXml() {
         return '<dateTime.iso8601>'.$this->getIso().'</dateTime.iso8601>';