Fix Windows time zone name extraction. Update API docs

tests/corelib/date_time_test.dart

Index: tests/corelib/date_time_test.dart
diff --git a/tests/corelib/date_time_test.dart b/tests/corelib/date_time_test.dart
index efb22069682ed38bb71f9c4b9481409a2d8b3f8c..27758f82e9c4ec60beef3ff5a8e94ecea7adb736 100644
--- a/tests/corelib/date_time_test.dart
+++ b/tests/corelib/date_time_test.dart
@@ -1234,7 +1234,7 @@ void testToStrings() {
       String source1 = "$date ${time}Z";
       String source2 = "${date}T${time}Z";
       var utcTime1 = DateTime.parse(source1);
-      var utcTime2 = DateTime.parse(source1);
+      var utcTime2 = DateTime.parse(source2);
       Expect.isTrue(utcTime1.isUtc);
       Expect.equals(utcTime1, utcTime2);
       Expect.equals(source1, utcTime1.toString());
@@ -1244,7 +1244,7 @@ void testToStrings() {
       String source1 = "$date $time";
       String source2 = "${date}T$time";
       var utcTime1 = DateTime.parse(source1);
-      var utcTime2 = DateTime.parse(source1);
+      var utcTime2 = DateTime.parse(source2);
       Expect.isFalse(utcTime1.isUtc);
       Expect.equals(utcTime1, utcTime2);
       Expect.equals(source1, utcTime1.toString());