diff -r 000000000000 -r 6474c204b198 js/src/tests/Intl/DateTimeFormat/format.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/Intl/DateTimeFormat/format.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Tests the format function with a diverse set of locales and options.
+// Always use UTC to avoid dependencies on test environment.
+
+var format;
+var date = Date.UTC(2012, 11, 12, 3, 0, 0);
+var longFormatOptions = {timeZone: "UTC",
+                         year: "numeric", month: "long", day: "numeric",
+                         hour: "numeric", minute: "numeric", second: "numeric"};
+
+// Locale en-US; default options.
+format = new Intl.DateTimeFormat("en-us", {timeZone: "UTC"});
+assertEq(format.format(date), "12/12/2012");
+
+// Locale th-TH; default options.
+// Thailand uses the Buddhist calendar.
+format = new Intl.DateTimeFormat("th-th", {timeZone: "UTC"});
+assertEq(format.format(date), "12/12/2555");
+
+// Locale th-TH; long format, Thai digits.
+format = new Intl.DateTimeFormat("th-th-u-nu-thai", longFormatOptions);
+assertEq(format.format(date), "๑๒ ธันวาคม ๒๕๕๕ ๐๓:๐๐:๐๐");
+
+// Locale ja-JP; long format.
+format = new Intl.DateTimeFormat("ja-jp", longFormatOptions);
+assertEq(format.format(date), "2012年12月12日 3:00:00");
+
+// Locale ar-MA; long format, Islamic civilian calendar.
+format = new Intl.DateTimeFormat("ar-ma-u-ca-islamicc", longFormatOptions);
+assertEq(format.format(date), "28 محرم، 1434 3:00:00 ص");
+
+reportCompare(0, 0, 'ok');