Rename Date to DateTime.

tests/standalone/io/test_runner_exit_code_script.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.
 
 // Simulates a use of test_progress during a failing run of test.dart.
 
 import "../../../tools/testing/dart/test_progress.dart";
 import "../../../tools/testing/dart/test_runner.dart";
 import "../../../tools/testing/dart/test_options.dart";
 
 main() {
   var progressType = new Options().arguments[0];
   // Build a progress indicator.
-  var startTime = new Date.now();
+  var startTime = new DateTime.now();
   var progress =
     new ProgressIndicator.fromName(progressType, startTime, false);
   if (progressType == 'buildbot') {
     BuildbotProgressIndicator.stepName = 'myStepName';
   }
   // Build a dummy test case.
   var configuration = new TestOptionsParser().parse(['--timeout', '2'])[0];
   var dummyCommand = new Command("noop", []);
   var testCase = new TestCase('failing_test.dart',
                               [dummyCommand],
                               configuration,
                               (_) => null,
                               new Set<String>.from(['PASS']));
 
   // Simulate the test.dart use of the progress indicator.
   progress.testAdded();
   progress.allTestsKnown();
   progress.start(testCase);
   new CommandOutput.fromCase(testCase, dummyCommand, 1, false, false, [], [],
-                             new Date.now().difference(startTime), false);
+                             new DateTime.now().difference(startTime), false);
   progress.done(testCase);
   progress.allDone();
 }