Rename Date to DateTime.

samples/swarm/DataSource.dart

Index: samples/swarm/DataSource.dart
diff --git a/samples/swarm/DataSource.dart b/samples/swarm/DataSource.dart
index 8c7d0e82fe8c2af76a5d3f4d7f5a926ce74588d9..5b56c9986f34b3a746d6f023a26d6d06eac286bc 100644
--- a/samples/swarm/DataSource.dart
+++ b/samples/swarm/DataSource.dart
@@ -167,7 +167,7 @@ class Feed {
 /** A single article or posting to display. */
 class Article {
   final String id;
-  Date date;
+  DateTime date;
   final String title;
   final String author;
   final bool hasThumbnail;
@@ -236,7 +236,7 @@ class Article {
     final dateInSeconds = decoder.readInt();
     final snippet = decoder.readString();
     final date =
-        new Date.fromMillisecondsSinceEpoch(dateInSeconds*1000, isUtc: true);
+        new DateTime.fromMillisecondsSinceEpoch(dateInSeconds*1000, isUtc: true);
     return new Article(source, id, date, title, author, srcUrl, hasThumbnail,
         snippet);
   }