SoerenDPetersen/site-scripts.html at main · sorpet/SoerenDPetersen · GitHub

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<script>
(function () {
  function parseLocalDate(value) {
    var parts = value.split("-").map(Number);
    return new Date(parts[0], parts[1] - 1, parts[2]);
  }

  function calculateAge(birthDate, today) {
    var age = today.getFullYear() - birthDate.getFullYear();
    var birthdayThisYear = new Date(
      today.getFullYear(),
      birthDate.getMonth(),
      birthDate.getDate()
    );

    if (today < birthdayThisYear) age -= 1;
    return age;
  }

  document.querySelectorAll("[data-birthdate]").forEach(function (element) {
    var birthDate = parseLocalDate(element.dataset.birthdate);
    if (Number.isNaN(birthDate.getTime())) return;

    var age = calculateAge(birthDate, new Date());
    var format = element.dataset.ageFormat || "years-old";

    if (format === "adjective") {
      element.textContent = age + "-year-old";
    } else if (format === "number") {
      element.textContent = age;
    } else {
      element.textContent = age + " years old";
    }
  });
}());
</script>