最流行的日期选取器之一是date_picker_timeline

Column(
    mainAxisAlignment: MainAxisAlignment.center,
    children: <Widget>[
      DatePicker(
        DateTime.now(),
        initialSelectedDate: DateTime.now(),
        selectionColor: Colors.black,
        selectedTextColor: Colors.white,
        onDateChange: (date) {
          // New date selected
          setState(() {
            _selectedValue = date;
          });
        },
      ),
    ],
)

用户也可以在警报框https://pub.dev/packages/calendar_date_picker2中使用此选项