import 'package:flutter/material.dart';

import 'package:intl/intl.dart';

import 'dart:async';

class DateTimeDemo extends StatefulWidget {

  @override

  _DateTimeDemoState createState() => _DateTimeDemoState();

}

class _DateTimeDemoState extends State<DateTimeDemo> {

  DateTime selectedDate = DateTime.now();

  TimeOfDay selectedTime = TimeOfDay(hour: 9, minute: 30);

  Future<void> _selectDate() async {

    final DateTime date = await showDatePicker(

      context: context,

      initialDate: selectedDate,

      firstDate: DateTime(1900),

      lastDate: DateTime(2100),

    );

    if (date == null) return;

    setState(() {

      selectedDate = date;

    });

  }

  Future<void> _selectTime() async {

    final TimeOfDay time = await showTimePicker(

      context: context,

      initialTime: selectedTime,

    );

    if (time == null) return;

    setState(() {

      selectedTime = time;

    });

  } 

  @override

  Widget build(BuildContext context) {

    return Scaffold(

      appBar: AppBar(

        title: Text('DateTimeDemo'),

        elevation: 0.0,

      ),

      body: Container(

        padding: EdgeInsets.all(16.0),

        child: Column(

          mainAxisAlignment: MainAxisAlignment.center,

          children: <Widget>[

            Row(

              mainAxisAlignment: MainAxisAlignment.center,

              children: <Widget>[

                InkWell(

                  onTap: _selectDate,

                  child: Row(

                    children: <Widget>[

                      Text(DateFormat.yMMMMd().format(selectedDate)),

                      Icon(Icons.arrow_drop_down),

                    ],

                  ),

                ),

                InkWell(

                  onTap: _selectTime,

                  child: Row(

                    children: <Widget>[

                      Text(selectedTime.format(context)),

                      Icon(Icons.arrow_drop_down),

                    ],

                  ),

                ),

              ],

            ),

          ],

        ),

      )

    );

  }

}

 pubspec.yaml中添加 intl_translation: ^0.17.2