export const checkDateOfBirth = (value: string) => {
  if (!value || value === "") return "Bu alan boş bırakılamaz.";

  const inputDate = value.substring(0, 2);
  const inputMonth = value.substring(3, 5);
  const inputYear = value.substring(6, 10);
  const newDate = new Date();
  const date = newDate.getDate();
  const month = newDate.getMonth() + 1;
  const year = newDate.getFullYear();
  const customDate = new Date(
    `${inputMonth}.${inputDate}.${inputYear}`,
  ).getTime();
  const todayDate = new Date().getTime();

  if (customDate > todayDate) {
    return "Bugünden büyük tarihler girilemez.";
  }

  if (Number(inputYear) < year - 100) {
    return "Geçersiz tarih!";
  }
  if (Number(inputYear) === year - 100) {
    if (Number(inputMonth) === month) {
      if (Number(inputDate) < date) {
        return "Geçersiz tarih!";
      }
    } else if (Number(inputMonth) < month) {
      return "Geçersiz tarih!";
    }
  }
  return true;
};