カレンダー作る手がかり

calendar.dart

    final today = new DateTime.now();
    final lastday = new DateTime(today.year, today.month+1, 0);
    final firstday = new DateTime(today.year, today.month,1);
    final calendar = new List.generate(35, (i) => 
      new DateTime(firstday.year, firstday.month, firstday.day + (i-firstday.weekday))
    );