Rename Date to DateTime.

utils/template/uitest.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:html';
 import 'template.dart';
 import '../lib/file_system_memory.dart';
 
 String currSampleTemplate;
 
@@ skipping 306 matching lines @@
                 </div>
               ${endEach}
             </div>
           </div>
         ${endEach}
       </div>
     ${endEach}
   </div>
 }
 
-template Header(String company, Date date) {
+template Header(String company, DateTime date) {
   css {
     .header {
       background-color: slateGray;
       font-family: arial;
       color: lightgray;
       font-weight: bold;
       padding-top: 20px;
     }
   }
   <div class='header' align=center>
@@ skipping 226 matching lines @@
   initHtmlWorld(false);
 
   // Don't display any colors in the UI.
   options.useColors = false;
 
   // Replace error handler bring up alert for any problems.
   world.printHandler = (String msg) {
     window.alert(msg);
   };
 }