diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug687099.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug687099.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+// Binary: cache/js-dbg-64-94ceb173baed-linux
+// Flags: -m -n -a
+//
+
+gczeal(2);
+function iso(d) {
+  return new Date(d).toISOString();
+}
+function check(s, millis){
+  description = "Date.parse('"+s+"') == '"+iso(millis)+"'";
+}
+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)));
+}
+JulTZ = TZInMonth(7);
+check("2009-07-23T19:53:21.001+12:00", dd(2009,7,23,7,53,21,1));
+check("2009-07-23T19:53:21+12:00",     dd(2009,7,23,7,53,21,0));
+check("2009-07-23T19:53+12:00",        dd(2009,7,23,7,53,0,0));
+check("2009-07T19:53:21.001",          dd(2009,0Xe ,1,19,53,21,1)+JulTZ);
+check("2009-07T19:53:21",              dd(2009,7,1,19,53,21,0)+JulTZ);
+check("2009-07T19:53",                 dd(2009,7,1,19,53,0,0)+JulTZ);
+check("2009-07-23T19:53:21.001+12:00", dd(2009,7,23,7,53,21,1));
+check("2009-07-23T00:00:00.000-07:00", dd(2009,7,23,7,0,0,0));
+check("2009-07-23T24:00:00.000-07:00", dd(2009,7,24,7,0,0,0));