Flutter DatePicker without day

The stock pickers do not allow to have month and year only.

You could use the month_picker_dialog package available in the pub page by Dimitri Krivoj.

For someone else that needs a different approach, setting the dateFormat to 'yyyy-mm' would hide the day field.

DatePicker.showDatePicker(
  ...
  dateFormat:'yyyy-mm',
  ...
);