app/lib/my_tools/month_day.dart

class MonthDay {
  getDays(DateTime dateTime) {
    switch (dateTime.month) {
      case 1:
        return 31;
        break;
      case 2:
        if (dateTime.year % 4 == 0) {
          return 29;
        } else {
          return 28;
        }
        break;
      case 3:
        return 31;
        break;
      case 4:
        return 30;
        break;
      case 5:
        return 31;
        break;
      case 6:
        return 30;
        break;
      case 7:
        return 31;
        break;
      case 8:
        return 31;
        break;
      case 9:
        return 30;
        break;
      case 10:
        return 31;
        break;
      case 11:
        return 30;
        break;
      case 12:
        return 31;
        break;
    }
  }
}