DatePicker

date_picker.dart

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  DateTime selectedDate = DateTime.now();
  final sDateFormate = "dd/MM/yyyy";
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Text(_formatDate(selectedDate)),
            const SizedBox(
              height: 20.0,
            ),
            ElevatedButton(
              onPressed: () => _selectDate(context),
              child: const Text('Select date'),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> _selectDate(BuildContext context) async {
    DateTime currentDate = DateTime.now();
    DateTime initialDate = selectedDate ?? currentDate;

    DateTime? picked = await showDatePicker(
      context: context,
      initialDate: initialDate,
      firstDate: DateTime(1900),
      lastDate: currentDate,
    );

    if (picked != null) {
      setState(() {
        selectedDate = picked;
      });
    }
  }

  String _formatDate(DateTime date) {
    return DateFormat('MM/dd/yyyy').format(date);
  }
}