diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/extensions/15.9.4.2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/extensions/15.9.4.2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 682754;
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function iso(d)
+{
+  return new Date(d).toISOString();
+}
+
+function check(s, millis){
+  description = "Date.parse('"+s+"') == '"+iso(millis)+"'";
+  expected = millis;
+  actual = Date.parse(s);
+  reportCompare(expected, actual, description);
+}
+
+function checkInvalid(s)
+{
+  description = "Date.parse('"+s+"') produces invalid date";
+  expected = NaN;
+  actual = Date.parse(s);
+  reportCompare(expected, actual, description);
+}
+
+function dd(year, month, day, hour, minute, second, millis){
+  return Date.UTC(year, month-1, day, hour, minute, second, millis);
+}
+
+function TZAtDate(d){
+  return d.getTimezoneOffset() * 60000;
+}
+
+function TZInMonth(month){
+  return TZAtDate(new Date(dd(2009,month,1,0,0,0,0)));
+}
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+
+  JanTZ = TZInMonth(1);
+  JulTZ = TZInMonth(7);
+  CurrTZ = TZAtDate(new Date());
+
+  // Allow non-standard "-0700" as timezone, not just "-07:00"
+  check("2009-07-23T00:53:21.001-0700", dd(2009,7,23,7,53,21,1));
+
+  exitFunc ('test');
+}