Make isUtc a getter, change some method names in Date.

lib/compiler/implementation/lib/js_helper.dart

Index: lib/compiler/implementation/lib/js_helper.dart
diff --git a/lib/compiler/implementation/lib/js_helper.dart b/lib/compiler/implementation/lib/js_helper.dart
index a5cb94f47ff5942f94820fd7f4ae4fd50ab75731..807a519e21315da5ee6745c54f4525b4fb338beb 100644
--- a/lib/compiler/implementation/lib/js_helper.dart
+++ b/lib/compiler/implementation/lib/js_helper.dart
@@ -517,55 +517,56 @@ class Primitives {
   // Lazily keep a JS Date stored in the JS object.
   static lazyAsJsDate(receiver) {
     if (JS('bool', @'#.date === (void 0)', receiver)) {
-      JS('void', @'#.date = new Date(#)', receiver, receiver.value);
+      JS('void', @'#.date = new Date(#)', receiver,
+         receiver.millisecondsSinceEpoch);
     }
     return JS('Date', @'#.date', receiver);
   }
 
   static getYear(receiver) {
-    return (receiver.isUtc())
+    return (receiver.isUtc)
       ? JS('int', @'#.getUTCFullYear()', lazyAsJsDate(receiver))
       : JS('int', @'#.getFullYear()', lazyAsJsDate(receiver));
   }
 
   static getMonth(receiver) {
-    return (receiver.isUtc())
+    return (receiver.isUtc)
       ? JS('int', @'#.getUTCMonth()', lazyAsJsDate(receiver)) + 1
       : JS('int', @'#.getMonth()', lazyAsJsDate(receiver)) + 1;
   }
 
   static getDay(receiver) {
-    return (receiver.isUtc())
+    return (receiver.isUtc)
       ? JS('int', @'#.getUTCDate()', lazyAsJsDate(receiver))
       : JS('int', @'#.getDate()', lazyAsJsDate(receiver));
   }
 
   static getHours(receiver) {
-    return (receiver.isUtc())
+    return (receiver.isUtc)
       ? JS('int', @'#.getUTCHours()', lazyAsJsDate(receiver))
       : JS('int', @'#.getHours()', lazyAsJsDate(receiver));
   }
 
   static getMinutes(receiver) {
-    return (receiver.isUtc())
+    return (receiver.isUtc)
       ? JS('int', @'#.getUTCMinutes()', lazyAsJsDate(receiver))
       : JS('int', @'#.getMinutes()', lazyAsJsDate(receiver));
   }
 
   static getSeconds(receiver) {
-    return (receiver.isUtc())
+    return (receiver.isUtc)
       ? JS('int', @'#.getUTCSeconds()', lazyAsJsDate(receiver))
       : JS('int', @'#.getSeconds()', lazyAsJsDate(receiver));
   }
 
   static getMilliseconds(receiver) {
-    return (receiver.isUtc())
+    return (receiver.isUtc)
       ? JS('int', @'#.getUTCMilliseconds()', lazyAsJsDate(receiver))
       : JS('int', @'#.getMilliseconds()', lazyAsJsDate(receiver));
   }
 
   static getWeekday(receiver) {
-    return (receiver.isUtc())
+    return (receiver.isUtc)
       ? JS('int', @'#.getUTCDay()', lazyAsJsDate(receiver))
       : JS('int', @'#.getDay()', lazyAsJsDate(receiver));
   }