date picker in flutter code example

Example 1: DateFormat in flutter

ICU Name                   Skeleton
 --------                   --------
 DAY                          d
 ABBR_WEEKDAY                 E
 WEEKDAY                      EEEE
 ABBR_STANDALONE_MONTH        LLL
 STANDALONE_MONTH             LLLL
 NUM_MONTH                    M
 NUM_MONTH_DAY                Md
 NUM_MONTH_WEEKDAY_DAY        MEd
 ABBR_MONTH                   MMM
 ABBR_MONTH_DAY               MMMd
 ABBR_MONTH_WEEKDAY_DAY       MMMEd
 MONTH                        MMMM
 MONTH_DAY                    MMMMd
 MONTH_WEEKDAY_DAY            MMMMEEEEd
 ABBR_QUARTER                 QQQ
 QUARTER                      QQQQ
 YEAR                         y
 YEAR_NUM_MONTH               yM
 YEAR_NUM_MONTH_DAY           yMd
 YEAR_NUM_MONTH_WEEKDAY_DAY   yMEd
 YEAR_ABBR_MONTH              yMMM
 YEAR_ABBR_MONTH_DAY          yMMMd
 YEAR_ABBR_MONTH_WEEKDAY_DAY  yMMMEd
 YEAR_MONTH                   yMMMM
 YEAR_MONTH_DAY               yMMMMd
 YEAR_MONTH_WEEKDAY_DAY       yMMMMEEEEd
 YEAR_ABBR_QUARTER            yQQQ
 YEAR_QUARTER                 yQQQQ
 HOUR24                       H
 HOUR24_MINUTE                Hm
 HOUR24_MINUTE_SECOND         Hms
 HOUR                         j
 HOUR_MINUTE                  jm
 HOUR_MINUTE_SECOND           jms
 HOUR_MINUTE_GENERIC_TZ       jmv
 HOUR_MINUTE_TZ               jmz
 HOUR_GENERIC_TZ              jv
 HOUR_TZ                      jz
 MINUTE                       m
 MINUTE_SECOND                ms
 SECOND                       s

Example 2: flutter date time

var now = new DateTime.now();
var moonLanding = DateTime.parse(now);

moonLanding.year; 
moonLanding.hour;  
moonLanding.month; 

moonLanding.year.toString() + '-' + moonLanding.month.toString() + '-' + moonLanding.day.toString()

############################ OR ###########################

import 'package:intl/intl.dart';

var dt = DateTime.now();
var newFormat = DateFormat("yy-MM-dd");
String updatedDt = newFormat.format(dt);
print(updatedDt); // 20-04-03

var newDt = DateFormat.yMMMEd().format(dt);
print(newDt);  // Fri, Apr 3, 2020

reference :
https://medium.com/flutter-community/working-with-dates-in-dart-e81c70911811