data.getTime is not a function

Estou fazendo um formulário próprio mas todo baseado no formulário do curso Aparentemente segui todas as instruções, mas continua dando erro na data (sou novo na plataforma e não sei se poderia estar tirando dúvidas visto que não estou usando exatamente o mesmo código do curso)

//mensagem de erro

NewInput.js:13 Uncaught TypeError: data.getTime is not a function
    at new NewInput (NewInput.js:13)
    at RegisterController.addRegister (RegisterController.js:30)

//classe construtura

class NewInput {
  constructor(program, tipoInput, input, partnumber, ecode,descriptions, partquantity, nestquantity, serialnumber, sprint, data, status) {
    this._program = program;
    this._tipoInput = tipoInput;
    this._input = input;
    this._partnumber = partnumber;
    this._ecode = ecode
    this._descriptions = descriptions;
    this._partquantity = partquantity;
    this._nestquantity = nestquantity;
    this._serialnumber = serialnumber;
    this._sprint = sprint;
    this._data = new Date(data.getTime());
    this._status = status;
    Object.freeze(this);
  }

  get program() {
    return this._program;
  }

  get tipoInput() {
    return this._tipoInput;
  }

  get input() {
    return this._input;
  }

  get partnumber() {
    return this._partnumber;
  }

  get ecode() {
    return this._ecode;
  }

  get descriptions() {
    return this._descriptions;
  }

  get partquantity() {
    return this._partquantity;
  }

  get nestquantity() {
    return this._nestquantity;
  }

  get serialnumber() {
    return this._serialnumber;
  }

  get sprint() {
    return this._sprint;
  }

  get dane() {
    return new Date(this._data.getTime());
  }

  get status() {
    return this._status;
  }

  get totalHourProg() {
    var hourProgStandard = 4.5;
    return this.partquantity * hourProgStandard;
  }

  get timeRemaining() {
    let today = new Date();
    return this.data - today;
  }
};

//controller

class RegisterController {

  constructor() {
    let $ = document.querySelector.bind(document);
    this._fieldProgram = $('#program');
    this._fieldTipoInput = $('#tipoInput');
    this._fieldInput = $('#input');
    this._fieldPartnumber = $('#partnumber');
    this._fieldEcode = $('#ecode');
    this._fieldDescription = $('#description');
    this._fieldPartquantity = $('#partquantity');
    this._fieldNestquantity = $('#nestquantity');
    this._fieldHourprog = $('#hourprog');
    this._fieldHourremaining = $('#hourremaining');
    this._fieldSerialnumber = $('#serialnumber');
    this._fieldSprint = $('#sprint');
    this._fieldDate = $('#dane');
    this._fieldStatus = $('#status');

  }
  addRegister(event) {
    event.preventDefault();

    let data = new Date(...
      this._fieldDate.value
          .split("-")
          .map((item, indice) => item - indice % 2)
      );

    let newInput = new NewInput (

      this._fieldProgram.value,
      this._fieldTipoInput.value,
      this._fieldInput.value,
      this._fieldPartnumber.value,
      this._fieldEcode.value,
      this._fieldDescription.value,
      this._fieldPartquantity.value,
      this._fieldNestquantity.value,
      this._fieldHourprog.value,
      this._fieldHourremaining.value,
      this._fieldSerialnumber.value,
      this._fieldSprint.value,
      data,
      this._fieldStatus.value
    );
    console.log(newInput);
  }
}

obrigado desde já!