diff --git a/js/mage/adminhtml/flexuploader.js b/js/mage/adminhtml/flexuploader.js
index 6f59d36487e..7a10a5779c6 100644
--- a/js/mage/adminhtml/flexuploader.js
+++ b/js/mage/adminhtml/flexuploader.js
@@ -213,7 +213,7 @@ if(!window.Flex) {
 
                         document.cookie = escape(response.cookie.name) + "="
                             + escape(response.cookie.value)
-                            + "; expires=" + date.toGMTString()
+                            + "; expires=" + date.toUTCString()
                             + (response.cookie.path.blank() ? "" : "; path=" + response.cookie.path)
                             + (response.cookie.domain.blank() ? "" : "; domain=" + response.cookie.domain);
                     }
diff --git a/js/mage/adminhtml/tools.js b/js/mage/adminhtml/tools.js
index e756dd3fcad..22f40dc5b10 100644
--- a/js/mage/adminhtml/tools.js
+++ b/js/mage/adminhtml/tools.js
@@ -525,7 +525,7 @@ var Cookie = {
         if (cookieLifeTime) {
             var date = new Date();
             date.setTime(date.getTime()+(cookieLifeTime*1000));
-            expires = '; expires='+date.toGMTString();
+            expires = '; expires='+date.toUTCString();
         }
         var urlPath = '/' + BASE_URL.split('/').slice(3).join('/'); // Get relative path
         document.cookie = escape(cookieName) + "=" + escape(cookieValue) + expires + "; path=" + urlPath;
diff --git a/js/mage/cookies.js b/js/mage/cookies.js
index e21974b89d0..b2f6a5e4074 100644
--- a/js/mage/cookies.js
+++ b/js/mage/cookies.js
@@ -39,7 +39,7 @@ Mage.Cookies.set = function(name, value){
      var domain = (argc > 4) ? argv[4] : Mage.Cookies.domain;
      var secure = (argc > 5) ? argv[5] : Mage.Cookies.secure;
      document.cookie = name + "=" + escape (value) +
-       ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
+       ((expires == null) ? "" : ("; expires=" + expires.toUTCString())) +
        ((path == null) ? "" : ("; path=" + path)) +
        ((domain == null) ? "" : ("; domain=" + domain)) +
        ((secure == true) ? "; secure" : "");
diff --git a/js/prototype/window.js b/js/prototype/window.js
index c684f79b3e5..80b606cdff0 100644
--- a/js/prototype/window.js
+++ b/js/prototype/window.js
@@ -1817,7 +1817,7 @@ var WindowUtilities = {
   
   setCookie: function(value, parameters) {
     document.cookie= parameters[0] + "=" + escape(value) +
-      ((parameters[1]) ? "; expires=" + parameters[1].toGMTString() : "") +
+      ((parameters[1]) ? "; expires=" + parameters[1].toUTCString() : "") +
       ((parameters[2]) ? "; path=" + parameters[2] : "") +
       ((parameters[3]) ? "; domain=" + parameters[3] : "") +
       ((parameters[4]) ? "; secure" : "");