Revert "Remove deprecated classes and functions in Date."

corelib/src/time_zone.dart

Index: corelib/src/time_zone.dart
diff --git a/corelib/src/time_zone.dart b/corelib/src/time_zone.dart
new file mode 100644
index 0000000000000000000000000000000000000000..5f12f935219f99ca065c920d25377a57187aae50
--- /dev/null
+++ b/corelib/src/time_zone.dart
@@ -0,0 +1,16 @@
+// Copyright (c) 2011, 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.
+
+// Dart core library.
+
+/**
+ * [TimeZone]s represent locations (for example Europe/Paris).
+ *
+ * *DEPRECATED*
+ */
+interface TimeZone default TimeZoneImplementation {
+  const TimeZone.utc();
+  TimeZone.local();
+  bool get isUtc();
+}