import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  DateTime _selectedDate = DateTime.now();

  Future<void> _selectDate(BuildContext context) async {
    final DateTime picked = await showDatePicker(
      context: context,
      initialDate: _selectedDate,
      firstDate: DateTime(2015, 8),
      lastDate: DateTime(2101),
    );
    if (picked != null && picked != _selectedDate)
      setState(() {
        _selectedDate = picked;
      });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter DatePicker 예제'),
      ),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Text("${_selectedDate.toLocal()}".split(' ')[0]),
            SizedBox(
              height: 20.0,
            ),
            ElevatedButton(
              onPressed: () => _selectDate(context),
              child: Text('날짜 선택'),
            ),
          ],
        ),
      ),
    );
  }
}