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

tests/standalone/io/timer_test.dart

Index: tests/standalone/io/timer_test.dart
diff --git a/tests/standalone/io/timer_test.dart b/tests/standalone/io/timer_test.dart
index 44f9673ae3e79ce2fe7292b9e5b4c1abadf8864c..8fd776aa78b46b9a9c5df2f1638bf7ccb55cee53 100644
--- a/tests/standalone/io/timer_test.dart
+++ b/tests/standalone/io/timer_test.dart
@@ -13,19 +13,19 @@ class TimerTest {
   static void testSimpleTimer() {
 
     void timeoutHandler(Timer timer) {
-      int endTime = (new Date.now()).value;
+      int endTime = (new Date.now()).millisecondsSinceEpoch;
       Expect.equals(true, (endTime - _startTime) >= _timeout);
       if (_iteration < _ITERATIONS) {
         _iteration++;
         _timeout = _timeout - _DECREASE;
-        _startTime = (new Date.now()).value;
+        _startTime = (new Date.now()).millisecondsSinceEpoch;
         new Timer(_timeout, timeoutHandler);
       }
     }
 
     _iteration = 0;
     _timeout = _STARTTIMEOUT;
-    _startTime = (new Date.now()).value;
+    _startTime = (new Date.now()).millisecondsSinceEpoch;
     new Timer(_timeout, timeoutHandler);
   }