function cpfValidation(strCPF) {
  strCPF = strCPF.trim();
  strCPF = strCPF.replace(/\D+/g, '');
  
  if (strCPF.length != 11) return false;
    
  const identical = Array(12).join(strCPF.substring(0, 1));
  if (strCPF == identical) return false;
  
  let Soma;
  let Resto;
  Soma = 0;

  for (i=1; i<=9; i++) Soma = Soma + parseInt(strCPF.substring(i-1, i)) * (11 - i);
  Resto = (Soma * 10) % 11;

  if ((Resto == 10) || (Resto == 11))  Resto = 0;
  if (Resto != parseInt(strCPF.substring(9, 10)) ) return false;

  Soma = 0;
  for (i = 1; i <= 10; i++) Soma = Soma + parseInt(strCPF.substring(i-1, i)) * (12 - i);
  Resto = (Soma * 10) % 11;

  if ((Resto == 10) || (Resto == 11))  Resto = 0;
  if (Resto != parseInt(strCPF.substring(10, 11) ) ) return false;
  return true;
}

function validateCPF(inputId, errorId, validEmpty = false) {
  const cpf = document.getElementById(inputId).value;
  if (validEmpty && cpf === '') {
    return true;
  }
  const cpfError = document.getElementById(errorId);
  if (!cpfValidation(cpf)) {
    cpfError.textContent = "CPF inválido.";
    return false;
  } else {
    cpfError.textContent = "";
    return true;
  }
}

function todayString() {
  let today = new Date();
  let dd = today.getDate();
  let mm = today.getMonth() + 1; //January is 0!
  const yyyy = today.getFullYear();
  if (dd < 10) {
    dd = '0' + dd;
  }
  if (mm < 10) {
    mm = '0' + mm;
  }
  today = yyyy + '-' + mm + '-' + dd;
  return today;
}

const today = todayString();

const nascimentos = document.getElementsByClassName("nascimento");
for (let i = 0; i < nascimentos.length; i++) {
  nascimentos[i].setAttribute("max", today);
  nascimentos[i].setAttribute("min", "1920-01-01");
  // nascimentos[i].max = new Date().toLocaleDateString('fr-ca');
}