Fixing DateTime values in dart2js serialized script values.

sdk/lib/html/html_common/conversions.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.
 
 
 // Conversions for IDBKey.
 //
 // Per http://www.w3.org/TR/IndexedDB/#key-construct
 //
 // "A value is said to be a valid key if it is one of the following types: Array
@@ skipping 44 matching lines @@
 /**
  * Ensures that the input is a JavaScript Array.
  *
  * Creates a new JavaScript array if necessary, otherwise returns the original.
  */
 List convertDartToNative_StringArray(List<String> input) {
   // TODO(sra).  Implement this.
   return input;
 }
 
+DateTime convertNativeToDart_DateTime(date) {
+  var millisSinceEpoch = JS('int', '#.getTime()', date);
+  return new DateTime.fromMillisecondsSinceEpoch(millisSinceEpoch, isUtc: true);
+}
+
+convertDartToNative_DateTime(DateTime date) {
+  return JS('', 'new Date(#)', date.millisecondsSinceEpoch);
+}
+
 
 // -----------------------------------------------------------------------------
 
 /// Converts a Dart value into a JavaScript SerializedScriptValue.
 convertDartToNative_SerializedScriptValue(value) {
   return _convertDartToNative_PrepareForStructuredClone(value);
 }
 
 /// Since the source object may be viewed via a JavaScript event listener the
 /// original may not be modified.
@@ skipping 37 matching lines @@
   writeSlot(int i, x) { copies[i] = x; }
   cleanupSlots() {}  // Will be needed if we mark objects with a property.
 
   // Returns the input, or a clone of the input.
   walk(e) {
     if (e == null) return e;
     if (e is bool) return e;
     if (e is num) return e;
     if (e is String) return e;
     if (e is DateTime) {
-      // TODO(sra).
-      throw new UnimplementedError('structured clone of DateTime');
+      return convertDartToNative_DateTime(e);
     }
     if (e is RegExp) {
       // TODO(sra).
       throw new UnimplementedError('structured clone of RegExp');
     }
 
     // The browser's internal structured cloning algorithm will copy certain
     // types of object, but it will copy only its own implementations and not
     // just any Dart implementations of the interface.
 
@@ skipping 96 matching lines @@
   readSlot(int i) => copies[i];
   writeSlot(int i, x) { copies[i] = x; }
 
   walk(e) {
     if (e == null) return e;
     if (e is bool) return e;
     if (e is num) return e;
     if (e is String) return e;
 
     if (isJavaScriptDate(e)) {
-      // TODO(sra).
-      throw new UnimplementedError('structured clone of DateTime');
+      return convertNativeToDart_DateTime(e);
     }
 
     if (isJavaScriptRegExp(e)) {
       // TODO(sra).
       throw new UnimplementedError('structured clone of RegExp');
     }
 
     if (isJavaScriptSimpleObject(e)) {
       // TODO(sra): If mustCopy is false, swizzle the prototype for one of a Map
       // implementation that uses the properies as storage.
@@ skipping 92 matching lines @@
 const String _serializedScriptValue =
     'num|String|bool|'
     'JSExtendableArray|=Object|'
     'Blob|File|ByteBuffer|TypedData'
     // TODO(sra): Add Date, RegExp.
     ;
 const annotation_Creates_SerializedScriptValue =
     const Creates(_serializedScriptValue);
 const annotation_Returns_SerializedScriptValue =
     const Returns(_serializedScriptValue);