partly fix date format dartbug.com/15811. this 0 pads.

pkg/intl/test/date_time_format_test_core.dart

Index: pkg/intl/test/date_time_format_test_core.dart
diff --git a/pkg/intl/test/date_time_format_test_core.dart b/pkg/intl/test/date_time_format_test_core.dart
index 989b264f84095ee649762cd36c21f3f2155795d1..ea7cfca8f9b883bd1d356d2ca29484929889fffc 100644
--- a/pkg/intl/test/date_time_format_test_core.dart
+++ b/pkg/intl/test/date_time_format_test_core.dart
@@ -372,6 +372,12 @@ void runDateTests(Function subsetFunc) {
     expect(local.hour, equals(parsed.hour));
     });
 
+  test('Test 0-padding', () {
+    var someDate = new DateTime(123, 1, 2, 3, 4, 5);
+    var format = new DateFormat('yyyy-MM-dd HH:mm:ss');
+    expect(format.format(someDate), '0123-01-02 03:04:05');
+  });
+
   test('Test default format', () {
     var someDate = new DateTime(2012, 1, 27, 20, 58, 59, 1);
     var emptyFormat = new DateFormat(null, "en_US");
@@ -446,4 +452,4 @@ void runDateTests(Function subsetFunc) {
     expect(basic, basicAgain);
     expect(first.month, 7);
   });
-}
+}