如何在Flutter中使用syncfusion_flutter_datepicker只获取DateTime格式的"date“

dependencies:
  syncfusion_flutter_datepicker: ^x.x.x

import 'package:syncfusion_flutter_datepicker/datepicker.dart';

class DatePickerPage extends StatefulWidget {
  @override
  _DatePickerPageState createState() => _DatePickerPageState();
}

class _DatePickerPageState extends State<DatePickerPage> {
  DateTime _selectedDate;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Date Picker'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Open Date Picker'),
          onPressed: () {
            _openDatePicker();
          },
        ),
      ),
    );
  }

  void _openDatePicker() async {
    final DateTime picked = await showDatePicker(
      context: context,
      initialDate: DateTime.now(),
      firstDate: DateTime(2000),
      lastDate: DateTime(2100),
    );
    if (picked != null) {
      setState(() {
        _selectedDate = picked;
      });
    }
  }
}