Fixed comments

test/built-ins/Date/prototype/toISOString/15.9.5.43-0-13.js

@@ -5,14 +5,14 @@
 es5id: 15.9.5.43-0-13
 description: >
     Date.prototype.toISOString - RangeError is thrown when value of
-    date is Date(1970, 0, 100000001, 0, 0, 0, 1), the time zone is
-    UTC(0)
+    date is outside the valid range of time. 
 ---*/
 
-        var timeZoneMinutes = new Date().getTimezoneOffset() * (-1);
         var date, dateStr;
 
 assert.throws(RangeError, function() {
-                date = new Date(1970, 0, 100000001, 0, 0 + timeZoneMinutes + 60, 0, 1);
+                // As specified in ES5 15.9.1.14, time > 8.64e15 is not in the
+                // valid range.
+                date = new Date(8.64e15 + 1);
                 dateStr = date.toISOString();
 });