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function is1900Or2000(digit7) {
  return digit7 === 4 || digit7 === 9;
}

function is1800Or1900(digit7) {
  return digit7 > 4;
}

function toDate(year, month, day) {
  return new Date(Date.UTC(year, month - 1, day, 0, 0, 0, 0));
}

function calculateYear(digit7, dateSegments) {
  var year = toDate(dateSegments[2], dateSegments[1], dateSegments[0]).getFullYear();
  if (is1900Or2000(digit7)) {
    if (year <= 1936) {
      return year + 100;
    }
  } else if (is1800Or1900(digit7)) {
    return year > 1957 ? year - 100 : year + 100;
  }
  return year;
}

function getDate(cpr) {
  var dateSegments = cpr.substring(0, 6).match(/.{1,2}/g);
  return toDate(calculateYear(parseInt(cpr[6], 10), dateSegments), dateSegments[1], dateSegments[0]);
}

  JSON.stringify(cpr("2902004001")) ===
    JSON.stringify({ cpr: "2902004001", valid: true, date: new Date("2000-02-29T00:00:00.000Z"), sex: "Male" })

TypeError: date.getFullYear(...).slice is not a function