Fix the tests that change because of change to toISOString format.

test/mjsunit/mirror-date.js

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 39 matching lines @@
 
   // Parse JSON representation and check.
   var fromJSON = eval('(' + json + ')');
   assertEquals('object', fromJSON.type);
   assertEquals('Date', fromJSON.className);
   assertEquals(iso8601, fromJSON.value);
 }
 
 // Test Date values.
 testDateMirror(new Date(Date.parse("Dec 25, 1995 1:30 UTC")),
-               "1995-12-25T01:30:00Z");
+               "1995-12-25T01:30:00.000Z");
 d = new Date();
 d.setUTCFullYear(1967);
 d.setUTCMonth(0); // January.
 d.setUTCDate(17);
 d.setUTCHours(9);
 d.setUTCMinutes(22);
 d.setUTCSeconds(59);
 d.setUTCMilliseconds(0);
-testDateMirror(d, "1967-01-17T09:22:59Z");
+testDateMirror(d, "1967-01-17T09:22:59.000Z");
 d.setUTCMilliseconds(1);
-testDateMirror(d, "1967-01-17T09:22:59Z");
+testDateMirror(d, "1967-01-17T09:22:59.001Z");
 d.setUTCSeconds(12);
-testDateMirror(d, "1967-01-17T09:22:12Z");
+testDateMirror(d, "1967-01-17T09:22:12.001Z");
 d.setUTCSeconds(36);
-testDateMirror(d, "1967-01-17T09:22:36Z");
+testDateMirror(d, "1967-01-17T09:22:36.001Z");
+d.setUTCMilliseconds(136);
+testDateMirror(d, "1967-01-17T09:22:36.136Z");