Add microsecond support to DateTime.

tests/corelib/date_time_parse_test.dart

Index: tests/corelib/date_time_parse_test.dart
diff --git a/tests/corelib/date_time_parse_test.dart b/tests/corelib/date_time_parse_test.dart
index 2f489238566e8fc2b1198823dacfb6833de976bf..85f183a54f28669728c04390e39b06cbfcc58619 100644
--- a/tests/corelib/date_time_parse_test.dart
+++ b/tests/corelib/date_time_parse_test.dart
@@ -9,10 +9,19 @@ check(DateTime expected, String str) {
   Expect.equals(expected, actual);  // Only checks if they are at the same time.
   Expect.equals(expected.isUtc, actual.isUtc);
 }
+
+bool get supportsMicroseconds =>
+    new DateTime.fromMicrosecondsSinceEpoch(1).microsecondsSinceEpoch == 1;
+
 main() {
   check(new DateTime(2012, 02, 27, 13, 27), "2012-02-27 13:27:00");
-  check(new DateTime.utc(2012, 02, 27, 13, 27, 0, 123),
-        "2012-02-27 13:27:00.123456z");
+  if (supportsMicroseconds) {
+    check(new DateTime.utc(2012, 02, 27, 13, 27, 0, 123, 456),
+          "2012-02-27 13:27:00.123456z");
+  } else {
+    check(new DateTime.utc(2012, 02, 27, 13, 27, 0, 123, 456),
+          "2012-02-27 13:27:00.123z");
+  }
   check(new DateTime(2012, 02, 27, 13, 27), "20120227 13:27:00");
   check(new DateTime(2012, 02, 27, 13, 27), "20120227T132700");
   check(new DateTime(2012, 02, 27), "20120227");
@@ -31,8 +40,15 @@ main() {
   check(new DateTime.utc(2015, 02, 14, 13, 0, 0, 0),
         "2015-02-15T00:00:00+11:00");
 
-  check(new DateTime.utc(2015, 02, 15, 0, 0, 0, 501),
-        "2015-02-15T00:00:00.5005Z");
-  check(new DateTime.utc(2015, 02, 15, 0, 0, 0, 512),
-        "2015-02-15T00:00:00.5115Z");
+  if (supportsMicroseconds) {
+    check(new DateTime.utc(2015, 02, 15, 0, 0, 0, 500, 500),
+        "2015-02-15T00:00:00.500500Z");
+    check(new DateTime.utc(2015, 02, 15, 0, 0, 0, 511, 500),
+        "2015-02-15T00:00:00.511500Z");
+  } else {
+    check(new DateTime.utc(2015, 02, 15, 0, 0, 0, 501),
+        "2015-02-15T00:00:00.501Z");
+    check(new DateTime.utc(2015, 02, 15, 0, 0, 0, 512),
+        "2015-02-15T00:00:00.512Z");
+  }
 }