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