How much is the Flutter cost this month?
var defaultmonth = int.parse(DateFormat('yyyyMM').format(DateTime.now())); @override void minus() { setState(() { if (defaultmonth != DateTime.now().year - 1) { defaultmonth--; } }); } @override void add() { setState(() { if (defaultmonth != DateTime.now().year + 1) { defaultmonth++; } }); } I want…