dateIncrease method
Implementation
void dateIncrease({int day = 1}) {
var increased = (inputDate ?? DateTime.now()).add(Duration(days: day));
if ((increased).isBefore(lastDate ?? DateTime.now())) {
onChanged?.call(increased);
_disableNext.value = false;
} else {
_disableNext.value = true;
onChanged?.call((lastDate ?? DateTime.now()));
}
}