Rename Date to DateTime.

tests/standalone/io/http_connection_close_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.
 //
 
 import "dart:async";
 import "dart:io";
 import "dart:uri";
 
 void testHttp10Close(bool closeRequest) {
@@ skipping 29 matching lines @@
       server.close();
     };
   };
 }
 
 void testStreamResponse() {
   var server = new HttpServer();
   server.listen("127.0.0.1", 0, backlog: 5);
   server.defaultRequestHandler = (var request, var response) {
     new Timer.repeating(10, (x) {
-      Date now = new Date.now();
+      DateTime now = new DateTime.now();
       try {
         response.outputStream.writeString(
             'data:${now.millisecondsSinceEpoch}\n\n');
       } catch (e) {
         x.cancel();
         server.close();
       }
     });
   };
 
@@ skipping 12 matching lines @@
   connection.onError = (e) => Expect.isTrue(e is HttpException);
 }
 
 main() {
   testHttp10Close(false);
   testHttp10Close(true);
   testHttp11Close(false);
   testHttp11Close(true);
   testStreamResponse();
 }