Rename Date to DateTime.

tests/standalone/io/skipping_dart2js_compilations_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /*
  * This test makes sure that the "skipping Dart2Js compilations if the output is
  * already up to date" feature does work as it should.
  * Therefore this test ensures that compilations are only skipped if the last
  * modified date of the output of a dart2js compilation is newer than
  *   - the the dart application to compile (including it's dependencies)
@@ skipping 105 matching lines @@
 
   File _createFile(Path path) {
     var file = new File(path.toNativePath());
     file.createSync();
     return file;
   }
 }
 
 class TestCompletedHandler {
   FileUtils fileUtils;
-  Date _expectedTimestamp;
+  DateTime _expectedTimestamp;
   bool _shouldHaveRun;
 
   TestCompletedHandler(FileUtils this.fileUtils, bool this._shouldHaveRun);
 
   void processCompletedTest(runner.TestCase testCase) {
     var output = testCase.lastCommandOutput;
 
     Expect.isFalse(output.unexpectedOutput);
     Expect.isTrue(output.stderr.length == 0);
     if (_shouldHaveRun) {
@@ skipping 79 matching lines @@
     runTest("fs_notUpToDate_snapshot", fs_notUpToDate_snapshot, true);
     runTest("fs_notUpToDate_dart", fs_notUpToDate_dart, true);
     // This is the only test where all dependencies are present and the test.js
     // file is newer than all the others. So we pass 'false' for shouldRun.
     runTest("fs_upToDate", fs_upToDate, false);
   }
   // We need to wait some time to make sure that the files we 'touch' get a
   // bigger timestamp than the old ones
   new Timer(1000, touchFilesAndRunTests);
 }