diff --git a/public/js/icinga/timezone.js b/public/js/icinga/timezone.js
index ab1d0fc76..c92c57746 100644
--- a/public/js/icinga/timezone.js
+++ b/public/js/icinga/timezone.js
@@ -41,17 +41,9 @@
          *
          * @param {String} name
          * @param {String} value
-         * @param {Number} days
          */
-        writeCookie: function(name, value, days) {
-            var expires = '';
-
-            if (days) {
-                var date = new Date();
-                date.setTime(date.getTime()+(days*24*60*60*1000));
-                var expires = '; expires=' + date.toGMTString();
-            }
-            document.cookie = name + '=' + value + expires + '; path=/';
+        writeCookie: function(name, value) {
+            document.cookie = name + '=' + value + '; path=/';
         },
 
         /**