What is the correct way to add date picker in flutter app?

Question

In my app I am creating signup page where I need to add DOB. I want to add date picker in that but I am not getting correct way to do this.

Answer 1

A simple app showcasing its use:

import 'dart:async';

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, 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 != null && picked != selectedDate) {
      setState(() {
        selectedDate = picked;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Text("${selectedDate.toLocal()}".split(' ')[0]),
            SizedBox(height: 20.0,),
            RaisedButton(
              onPressed: () => _selectDate(context),
              child: Text('Select date'),
            ),
          ],
        ),
      ),
    );
  }
}

And a Dartpad with it:

https://dartpad.dev/e5a99a851ae747e517b75ac221b73529

Answer 2

Flutter provides showDatePicker function to achieve this. It is part of flutter material library.

You can find complete documentation at showDatePicker.

You can also find implemented example here: Date and Time Picker

Answer 3

Simple way is use CupertinoDatePicker class:

First import its package which building in flutter:

import 'package:flutter/cupertino.dart';

Then just add this widget in your form:

            Container(
              height: 200,
              child: CupertinoDatePicker(
                mode: CupertinoDatePickerMode.date,
                initialDateTime: DateTime(1969, 1, 1),
                onDateTimeChanged: (DateTime newDateTime) {
                  // Do something
                },
              ),
            ),

The result will be as this image:

Also you can change mode to (dateAndTime,time)... for example this for dateAndTime mode:

            Container(
              height: 200,
              child: CupertinoDatePicker(
                mode: CupertinoDatePickerMode.dateAndTime,
                initialDateTime: DateTime(1969, 1, 1, 11, 33),
                onDateTimeChanged: (DateTime newDateTime) {
                  //Do Some thing
                },
                use24hFormat: false,
                minuteInterval: 1,
              ),
            ),

The result will be as this image:

Answer 4

for time picker-

Declare this variable at class level

TimeOfDay selectedTime = TimeOfDay.now();

and call this method:-

Future<Null> _selectTime(BuildContext context) async {
    final TimeOfDay picked_s = await showTimePicker(
        context: context,
        initialTime: selectedTime, builder: (BuildContext context, Widget child) {
           return MediaQuery(
             data: MediaQuery.of(context).copyWith(alwaysUse24HourFormat: false),
            child: child,
          );});

    if (picked_s != null && picked_s != selectedTime )
      setState(() {
        selectedTime = picked_s;
      });
  }

Answer 5

At first, you need to create a variable. In that variable, you can store the chosen date as follows:

import 'package:flutter/material.dart';
import 'package:intl/intl.dart'; //this is an external package for formatting date and time

class DatePicker extends StatefulWidget {
  @override
  _DatePickerState createState() => _DatePickerState();
}

class _DatePickerState extends State<DatePicker> {
  DateTime _selectedDate;

  //Method for showing the date picker
  void _pickDateDialog() {
    showDatePicker(
            context: context,
            initialDate: DateTime.now(),
            //which date will display when user open the picker
            firstDate: DateTime(1950),
            //what will be the previous supported year in picker
            lastDate: DateTime
                .now()) //what will be the up to supported date in picker
        .then((pickedDate) {
      //then usually do the future job
      if (pickedDate == null) {
        //if user tap cancel then this function will stop
        return;
      }
      setState(() {
        //for rebuilding the ui
        _selectedDate = pickedDate;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        RaisedButton(child: Text('Add Date'), onPressed: _pickDateDialog),
        SizedBox(height: 20),
        Text(_selectedDate == null //ternary expression to check if date is null
            ? 'No date was chosen!'
            : 'Picked Date: ${DateFormat.yMMMd().format(_selectedDate)}'),
      ],
    );
  }
}

Second Option: Another option could be used by using https://pub.dev/packages/date_time_picker this library. You can use this library in your widget tree and store picked date or time in a variable as String:

At first, add the package in pubspec.yaml and then hit get packages. Only a date selection demo is given below and detailed implementation could be found in the given package url.

import 'package:flutter/material.dart';

import 'package:date_time_picker/date_time_picker.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(

        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Date Time'),
    );
  }
}

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

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  String _selectedDate;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.all(10.0),
              child: DateTimePicker(
                initialValue: '', // initialValue or controller.text can be null, empty or a DateTime string otherwise it will throw an error.
                type: DateTimePickerType.date,
                dateLabelText: 'Select Date',
                firstDate: DateTime(1995),
                lastDate: DateTime.now()
                    .add(Duration(days: 365)), // This will add one year from current date
                validator: (value) {
                  return null;
                },
                onChanged: (value) {
                  if (value.isNotEmpty) {
                    setState(() {
                    _selectedDate = value;
                    });
                  }
                },
                // We can also use onSaved
                onSaved: (value) {
                  if (value.isNotEmpty) {
                    _selectedDate = value;
                  }
                },
              ),
            ),
            SizedBox(height: 16),
            Text(
              'Your Selected Date: $_selectedDate',
              style: TextStyle(fontSize: 16),
            ),
          ],
        ),
      ),
    );
  }
}