Make date parser handle all ES5 Date Time Strings correctly.

test/mjsunit/date-parse.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
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@@ skipping 267 matching lines @@
 // Test that we can parse our own date format.
 // (Dates from 1970 to ~2070 with 150h steps.)
 for (var i = 0; i < 24 * 365 * 100; i += 150) {
   var ms = i * (3600 * 1000);
   var s = (new Date(ms)).toString();
   assertEquals(ms, Date.parse(s), "parse own: " + s);
 }
 
 // Negative tests.
 var testCasesNegative = [
-    'May 25 2008 1:30 (PM)) UTC',
-    'May 25 2008 1:30( )AM (PM)',
-    'May 25 2008 AAA (GMT)'];
+    'May 25 2008 1:30 (PM)) UTC',  // Bad unmatched ')' after number.
+    'May 25 2008 1:30( )AM (PM)',  // 
+    'May 25 2008 AAA (GMT)'];      // Unknown word after number.
 
 testCasesNegative.forEach(function (s) {
     assertTrue(isNaN(Date.parse(s)), s + " is not NaN.");
 });