Rename Date to DateTime.

tests/corelib/core_runtime_types_test.dart

Index: tests/corelib/core_runtime_types_test.dart
diff --git a/tests/corelib/core_runtime_types_test.dart b/tests/corelib/core_runtime_types_test.dart
index b68a1ff00e5bdb11cc48c36c940bd1718701f1f5..728adb449ee47b02d5c0f6b62d9fe31b17e7254f 100644
--- a/tests/corelib/core_runtime_types_test.dart
+++ b/tests/corelib/core_runtime_types_test.dart
@@ -253,11 +253,11 @@ class CoreRuntimeTypesTest {
 
   static testDateMethods() {
     var msec = 115201000;
-    var d = new Date.fromMillisecondsSinceEpoch(msec, isUtc: true);
+    var d = new DateTime.fromMillisecondsSinceEpoch(msec, isUtc: true);
     assertEquals(d.second, 1);
     assertEquals(d.year, 1970);
 
-    d = new Date.now();
+    d = new DateTime.now();
     assertEquals(d.year >= 2011, true);
   }