Space after comma for DateTimePicker

example/lib/main.dart

@@ -43,7 +43,7 @@ class HomePage extends StatelessWidget {
                     print('change $date');
                   }, onConfirm: (date) {
                     print('confirm $date');
-                  }, currentTime: DateTime.now(), locale: LocaleType.en);
+                  }, currentTime: DateTime.now(), locale: LocaleType.zh);
                 },
                 child: Text(
                   'show date picker(custom theme &date time range)',

lib/flutter_datetime_picker.dart

@@ -384,9 +384,6 @@ class _DatePickerState extends State<_DatePickerComponent> {
   Widget _renderTitleActionsView(DatePickerTheme theme) {
     String done = _localeDone();
     String cancel = _localeCancel();
-
-    var _cancelDown = false;
-    var _doneDown = false;
     
     return Container(
       height: theme.titleHeight,

lib/src/date_format.dart

@@ -242,7 +242,7 @@ String formatDate(DateTime date, List<String> formats, LocaleType locale) {
       } else if (locale == LocaleType.nl) {
         return formatDate(date, [D, ' ', dd, ' ', M, ' ', yyyy], locale);
       } else {
-        return formatDate(date, [D, ' ', M, ' ', dd, ',', yyyy], locale);
+        return formatDate(date, [D, ' ', M, ' ', dd, ', ', yyyy], locale);
       }
     }
   }