diff -r 5e7a0fedabdf -r 877f952ae2bd web/lib/Zend/Date/DateObject.php
--- a/web/lib/Zend/Date/DateObject.php	Thu Mar 21 17:31:31 2013 +0100
+++ b/web/lib/Zend/Date/DateObject.php	Thu Mar 21 19:50:53 2013 +0100
@@ -14,8 +14,8 @@
  *
  * @category   Zend
  * @package    Zend_Date
- * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
- * @version    $Id: DateObject.php 22712 2010-07-29 08:24:28Z thomas $
+ * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
+ * @version    $Id: DateObject.php 24880 2012-06-12 20:35:18Z matthew $
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
@@ -23,7 +23,7 @@
  * @category   Zend
  * @package    Zend_Date
  * @subpackage Zend_Date_DateObject
- * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 abstract class Zend_Date_DateObject {
@@ -312,6 +312,13 @@
         }
 
         if (abs($timestamp) <= 0x7FFFFFFF) {
+            // See ZF-11992
+            // "o" will sometimes resolve to the previous year (see 
+            // http://php.net/date ; it's part of the ISO 8601 
+            // standard). However, this is not desired, so replacing 
+            // all occurrences of "o" not preceded by a backslash 
+            // with "Y"
+            $format = preg_replace('/(?<!\\\\)o\b/', 'Y', $format);
             $result = ($gmt) ? @gmdate($format, $timestamp) : @date($format, $timestamp);
             date_default_timezone_set($oldzone);
             return $result;