Fix broken test in WebKit test suite and add the test in question to V8 tests...

test/mjsunit/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 129 matching lines @@
 
 // Test that toLocaleTimeString only returns the time portion of the
 // date without the timezone information.
 function testToLocaleTimeString() {
   var d = new Date();
   var s = d.toLocaleTimeString();
   assertEquals(8, s.length);
 }
 
 testToLocaleTimeString();
+
+
+// Modified test from WebKit
+// LayoutTests/fast/js/script-tests/date-utc-timeclip.js:
+
+assertEquals(Date.UTC(275760, 8, 12, 23, 59, 59, 999), 8639999999999999);
+assertEquals(Date.UTC(275760, 8, 13), 8640000000000000);
+assertTrue(isNaN(Date.UTC(275760, 8, 13, 0, 0, 0, 1)));
+assertTrue(isNaN(Date.UTC(275760, 8, 14)));
+
+assertEquals(Date.UTC(-271821, 3, 20, 0, 0, 0, 1), -8639999999999999);
+assertEquals(Date.UTC(-271821, 3, 20), -8640000000000000);
+assertTrue(isNaN(Date.UTC(-271821, 3, 19, 23, 59, 59, 999)));
+assertTrue(isNaN(Date.UTC(-271821, 3, 19)));