diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/Date/timeclip.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/Date/timeclip.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommonn.org/licenses/publicdomain/
+ */
+
+var BUGNUMBER = 747197;
+var summary = "TimeClip behavior for very large numbers";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function addToLimit(n) { return 8.64e15 + n; }
+
+assertEq(8.64e15 === addToLimit(0.0), true);
+assertEq(8.64e15 === addToLimit(0.5), true);
+assertEq(8.64e15 === addToLimit(0.5000000000000001), false);
+
+var times =
+  [Number.MAX_VALUE,
+   -Number.MAX_VALUE,
+   Infinity,
+   -Infinity,
+   addToLimit(0.5000000000000001),
+   -addToLimit(0.5000000000000001)];
+
+for (var i = 0, len = times.length; i < len; i++)
+{
+  var d = new Date();
+  assertEq(d.setTime(times[i]), NaN, "times[" + i + "]");
+  assertEq(d.getTime(), NaN);
+  assertEq(d.valueOf(), NaN);
+}
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");