factory Absence.fromJson(Map<dynamic, dynamic> json,
      [Register registerType = Register.Argo]) {
    if (registerType == Register.Argo) {
      return Absence(
        joinedLessonAt: json["numOra"],
        code: json["codEvento"],
        date: DateTime.parse(json["datAssenza"]),
        justified: json["flgDaGiustificare"],
        datJustified: json["datGiustificazione"],
        binUid: json["binUid"],
      );
    } else {
      final cvvCode = json["evtCode"];
      final String code =
          cvvCode == 'ABA0' ? 'A' : cvvCode == 'ABU0' ? 'U' : 'R';
      return Absence(
        joinedLessonAt: json["evtHPos"], //Posizione ora
        code: code,
        date: DateTime.parse(json["evtDate"]),
        justified: json["isJustified"],
        datJustified: null,
        binUid: json["evtId"],
      );
    }
  }