//add, intl Flutter package

DateTime datetime = DateTime.now();
print(datetime.toString());
//output: 2021-10-17 20:04:17.118089

String datetime1 = DateFormat("yyyy-MM-dd").format(datetime);
print(datetime1);
//output: 2021-10-17

String datetime2 = DateFormat.Hms().format(datetime);
print(datetime2);
//output (Time): 20:04:17

String datetime3 = DateFormat.MMMMEEEEd().format(datetime);
print(datetime3);
//output: Sunday, October 17