How to remove time in datepicker

showDatePicker provide nullable DateTime on return.

Future<DateTime?> showDatePicker({

That's why when we are assigning value on _dateTime you need to use ! Unless we null check 1st. ! means we say this value is not null.

Directly using ! will crash the app when user press cancel button on date picker. If you like to check the error, remove if condition and use ! directly.

  DateTime _dateTime = DateTime(2020);
  void _showDatePicker() {
    showDatePicker(
      context: context,
      initialDate: DateTime(2020, 1, 1),
      firstDate: DateTime(2020),
      lastDate: DateTime(2023),
    ).then((value) {
      if (value != null) { 
        setState(() {
          _dateTime = value;
        });
      }
    });
  }

To remove time from text you can use

  Text("${_dateTime.year} ${_dateTime.month} ${_dateTime.day} "),

Also using intel package provide more option.