Optimize DateTime properties

sdk/lib/_internal/compiler/js_lib/js_helper.dart

 // Copyright (c) 2013, 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.
 
 library _js_helper;
 
 import 'dart:_async_await_error_codes' as async_error_codes;
 
 import 'dart:_js_embedded_names' show
     DEFERRED_LIBRARY_URIS,
@@ skipping 1006 matching lines @@
   // may return -0.0 instead of 0.
 
   static getYear(receiver) {
     return (receiver.isUtc)
       ? JS('int', r'(#.getUTCFullYear() + 0)', lazyAsJsDate(receiver))
       : JS('int', r'(#.getFullYear() + 0)', lazyAsJsDate(receiver));
   }
 
   static getMonth(receiver) {
     return (receiver.isUtc)
-      ? JS('int', r'#.getUTCMonth() + 1', lazyAsJsDate(receiver))
-      : JS('int', r'#.getMonth() + 1', lazyAsJsDate(receiver));
+      ? JS('JSUInt31', r'#.getUTCMonth() + 1', lazyAsJsDate(receiver))
+      : JS('JSUInt31', r'#.getMonth() + 1', lazyAsJsDate(receiver));
   }
 
   static getDay(receiver) {
     return (receiver.isUtc)
-      ? JS('int', r'(#.getUTCDate() + 0)', lazyAsJsDate(receiver))
-      : JS('int', r'(#.getDate() + 0)', lazyAsJsDate(receiver));
+      ? JS('JSUInt31', r'(#.getUTCDate() + 0)', lazyAsJsDate(receiver))
+      : JS('JSUInt31', r'(#.getDate() + 0)', lazyAsJsDate(receiver));
   }
 
   static getHours(receiver) {
     return (receiver.isUtc)
-      ? JS('int', r'(#.getUTCHours() + 0)', lazyAsJsDate(receiver))
-      : JS('int', r'(#.getHours() + 0)', lazyAsJsDate(receiver));
+      ? JS('JSUInt31', r'(#.getUTCHours() + 0)', lazyAsJsDate(receiver))
+      : JS('JSUInt31', r'(#.getHours() + 0)', lazyAsJsDate(receiver));
   }
 
   static getMinutes(receiver) {
     return (receiver.isUtc)
-      ? JS('int', r'(#.getUTCMinutes() + 0)', lazyAsJsDate(receiver))
-      : JS('int', r'(#.getMinutes() + 0)', lazyAsJsDate(receiver));
+      ? JS('JSUInt31', r'(#.getUTCMinutes() + 0)', lazyAsJsDate(receiver))
+      : JS('JSUInt31', r'(#.getMinutes() + 0)', lazyAsJsDate(receiver));
   }
 
   static getSeconds(receiver) {
     return (receiver.isUtc)
-      ? JS('int', r'(#.getUTCSeconds() + 0)', lazyAsJsDate(receiver))
-      : JS('int', r'(#.getSeconds() + 0)', lazyAsJsDate(receiver));
+      ? JS('JSUInt31', r'(#.getUTCSeconds() + 0)', lazyAsJsDate(receiver))
+      : JS('JSUInt31', r'(#.getSeconds() + 0)', lazyAsJsDate(receiver));
   }
 
   static getMilliseconds(receiver) {
     return (receiver.isUtc)
-      ? JS('int', r'(#.getUTCMilliseconds() + 0)', lazyAsJsDate(receiver))
-      : JS('int', r'(#.getMilliseconds() + 0)', lazyAsJsDate(receiver));
+      ? JS('JSUInt31', r'(#.getUTCMilliseconds() + 0)', lazyAsJsDate(receiver))
+      : JS('JSUInt31', r'(#.getMilliseconds() + 0)', lazyAsJsDate(receiver));
   }
 
   static getWeekday(receiver) {
     int weekday = (receiver.isUtc)
       ? JS('int', r'#.getUTCDay() + 0', lazyAsJsDate(receiver))
       : JS('int', r'#.getDay() + 0', lazyAsJsDate(receiver));
     // Adjust by one because JS weeks start on Sunday.
     return (weekday + 6) % 7 + 1;
   }
 
@@ skipping 3005 matching lines @@
   // This is a function that will return a helper function that does the
   // iteration of the sync*.
   //
   // Each invocation should give a body with fresh state.
   final dynamic /* js function */ _outerHelper;
 
   SyncStarIterable(this._outerHelper);
 
   Iterator get iterator => new SyncStarIterator(JS('', '#()', _outerHelper));
 }