[ZF-11610] Forgot to include the actual fix when I committed r24644 ;)

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@24645 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Feed/Writer/Entry.php

@@ -214,7 +214,7 @@ class Zend_Feed_Writer_Entry
         $zdate = null;
         if ($date === null) {
             $zdate = new Zend_Date;
-        } elseif (ctype_digit($date)) {
+        } elseif (ctype_digit((string)$date)) {
             $zdate = new Zend_Date($date, Zend_Date::TIMESTAMP);
         } elseif ($date instanceof Zend_Date) {
             $zdate = $date;
@@ -235,7 +235,7 @@ class Zend_Feed_Writer_Entry
         $zdate = null;
         if ($date === null) {
             $zdate = new Zend_Date;
-        } elseif (ctype_digit($date)) {
+        } elseif (ctype_digit((string)$date)) {
             $zdate = new Zend_Date($date, Zend_Date::TIMESTAMP);
         } elseif ($date instanceof Zend_Date) {
             $zdate = $date;