diff --git a/browser/components/preferences/in-content/tests/browser_advanced_update.js b/browser/components/preferences/in-content/tests/browser_advanced_update.js
index 1dc3a32548b1..e9d0e86521e2 100644
--- a/browser/components/preferences/in-content/tests/browser_advanced_update.js
+++ b/browser/components/preferences/in-content/tests/browser_advanced_update.js
@@ -8,8 +8,6 @@ const { classes: Cc, interfaces: Ci, manager: Cm, utils: Cu, results: Cr } = Com
 Cu.import('resource://gre/modules/XPCOMUtils.jsm');
 
 const uuidGenerator = Cc["@mozilla.org/uuid-generator;1"].getService(Ci.nsIUUIDGenerator);
-const dateFormat = Cc["@mozilla.org/intl/scriptabledateformat;1"]
-                      .getService(Components.interfaces.nsIScriptableDateFormat);
 
 const mockUpdateManager = {
   contractId: "@mozilla.org/updates/update-manager;1",
@@ -87,15 +85,12 @@ function resetPreferences() {
 
 function formatInstallDate(sec) {
   var date = new Date(sec);
-  return dateFormat.FormatDateTime("",
-    dateFormat.dateFormatLong,
-    dateFormat.timeFormatSeconds,
-    date.getFullYear(),
-    date.getMonth() + 1,
-    date.getDate(),
-    date.getHours(),
-    date.getMinutes(),
-    date.getSeconds());
+  const locale = Cc["@mozilla.org/chrome/chrome-registry;1"]
+                 .getService(Ci.nsIXULChromeRegistry)
+                 .getSelectedLocale("global", true);
+  const dtOptions = { year: 'numeric', month: 'long', day: 'numeric',
+                      hour: 'numeric', minute: 'numeric', second: 'numeric' };
+  return date.toLocaleString(locale, dtOptions);
 }
 
 registerCleanupFunction(resetPreferences);
diff --git a/toolkit/mozapps/update/content/history.js b/toolkit/mozapps/update/content/history.js
index 624fd8a869dd..32a098de5322 100644
--- a/toolkit/mozapps/update/content/history.js
+++ b/toolkit/mozapps/update/content/history.js
@@ -58,18 +58,13 @@ var gUpdateHistory = {
    * @returns A human readable date string
    */
   _formatDate: function(seconds) {
-    var sdf =
-        Components.classes["@mozilla.org/intl/scriptabledateformat;1"].
-        getService(Components.interfaces.nsIScriptableDateFormat);
     var date = new Date(seconds);
-    return sdf.FormatDateTime("", sdf.dateFormatLong,
-                              sdf.timeFormatSeconds,
-                              date.getFullYear(),
-                              date.getMonth() + 1,
-                              date.getDate(),
-                              date.getHours(),
-                              date.getMinutes(),
-                              date.getSeconds());
+    const locale = Components.classes["@mozilla.org/chrome/chrome-registry;1"]
+                   .getService(Components.interfaces.nsIXULChromeRegistry)
+                   .getSelectedLocale("global", true);
+    const dtOptions = { year: 'numeric', month: 'long', day: 'numeric',
+                        hour: 'numeric', minute: 'numeric', second: 'numeric' };
+    return date.toLocaleString(locale, dtOptions);
   }
 };