main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @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 != _selectedDate) {
      setState(() {
        _selectedDate = picked;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            OutlinedButton(
              onPressed: () => _selectDate(context),
              style: OutlinedButton.styleFrom(
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(20),
                ),
              ),
              child: const Text('Select date'),
            ),
            Text(
              'Selected date: ${_selectedDate.toLocal()}'.split(' ')[0],
              style: const TextStyle(fontSize: 55, fontWeight: FontWeight.bold),
            ),
          ],
        ),
      ),
    );
  }
}