findMaxDate method
Implementation
DateTime? findMaxDate(int year, int month) {
DateTime? end;
_nodeMap.forEach((key, value) {
if (key.year == year && key.month == month) {
if (end == null) {
end = key;
} else {
if (key.isAfterDay(end!)) {
end = key;
}
}
}
});
return end;
}