js_runtime: Avoid calling JS Date constructor with years in range 00-99

tests/corelib/date_time10_test.dart

Index: tests/corelib/date_time10_test.dart
diff --git a/tests/corelib/date_time10_test.dart b/tests/corelib/date_time10_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3d7d34e0091c33afbbe6aff513be67def8fd0ccc
--- /dev/null
+++ b/tests/corelib/date_time10_test.dart
@@ -0,0 +1,54 @@
+// 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.
+
+import "package:expect/expect.dart";
+
+// Make sure the years in the range of single digits are handled correctly with
+// month roll-over. (This tests an edge condition when delegating to
+// JavaScript's Date constructor.)
+
+void check(String expected, DateTime actual) {
+  Expect.equals(expected, actual.toString());
+}
+
+testUtc() {
+  check("0099-01-01 00:00:00.000Z", new DateTime.utc(99, 1));
+  check("0100-01-01 00:00:00.000Z", new DateTime.utc(99, 1 + 12));
+  check("0000-01-01 00:00:00.000Z", new DateTime.utc(0, 1));
+  check("-0001-01-01 00:00:00.000Z", new DateTime.utc(0, 1 - 12));
+
+  check("0099-03-02 00:00:00.000Z", new DateTime.utc(99, 2, 30));
+  check("0100-03-02 00:00:00.000Z", new DateTime.utc(99, 2 + 12, 30));
+
+  check("0004-03-01 00:00:00.000Z", new DateTime.utc(3, 2 + 12, 30));
+  check("0004-03-01 00:00:00.000Z", new DateTime.utc(4, 2, 30));
+  check("0004-03-01 00:00:00.000Z", new DateTime.utc(5, 2 - 12, 30));
+
+  check("0005-03-02 00:00:00.000Z", new DateTime.utc(4, 2 + 12, 30));
+  check("0005-03-02 00:00:00.000Z", new DateTime.utc(5, 2, 30));
+  check("0005-03-02 00:00:00.000Z", new DateTime.utc(6, 2 - 12, 30));
+}
+
+testLocal() {
+  check("0099-01-01 00:00:00.000", new DateTime(99, 1));
+  check("0100-01-01 00:00:00.000", new DateTime(99, 1 + 12));
+  check("0000-01-01 00:00:00.000", new DateTime(0, 1));
+  check("-0001-01-01 00:00:00.000", new DateTime(0, 1 - 12));
+
+  check("0099-03-02 00:00:00.000", new DateTime(99, 2, 30));
+  check("0100-03-02 00:00:00.000", new DateTime(99, 2 + 12, 30));
+
+  check("0004-03-01 00:00:00.000", new DateTime(3, 2 + 12, 30));
+  check("0004-03-01 00:00:00.000", new DateTime(4, 2, 30));
+  check("0004-03-01 00:00:00.000", new DateTime(5, 2 - 12, 30));
+
+  check("0005-03-02 00:00:00.000", new DateTime(4, 2 + 12, 30));
+  check("0005-03-02 00:00:00.000", new DateTime(5, 2, 30));
+  check("0005-03-02 00:00:00.000", new DateTime(6, 2 - 12, 30));
+}
+
+main() {
+  testUtc();
+  testLocal();
+}