Rename Date to DateTime.

samples/clock/web/balls.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.
 
 part of clock;
 
 int get clientWidth => window.innerWidth;
 
 int get clientHeight => window.innerHeight;
 
@@ skipping 13 matching lines @@
       "images/ball-13acfa.png", "images/ball-265897.png",
       "images/ball-b6b4b5.png", "images/ball-c0000b.png",
       "images/ball-c9c9c9.png"
   ];
 
   DivElement root;
   num lastTime;
   List<Ball> balls;
 
   Balls() :
-      lastTime = new Date.now().millisecondsSinceEpoch,
+      lastTime = new DateTime.now().millisecondsSinceEpoch,
       balls = new List<Ball>() {
     root = new DivElement();
     document.body.nodes.add(root);
     makeAbsolute(root);
     setElementSize(root, 0.0, 0.0, 0.0, 0.0);
   }
 
   void tick(num now) {
     showFps(1000.0 / (now - lastTime + 0.01));
 
@@ skipping 122 matching lines @@
       y = clientHeight.toDouble();
       vy *= -RESTITUTION;
     }
 
     // Position the element.
     setElementPosition(elem, x - RADIUS, y - RADIUS);
 
     return true;
   }
 }