next.js/examples/cms-storyblok/components/date.js

import { parseISO, format } from "date-fns";
import { useEffect, useState } from "react";

// dateString might be null for unpublished posts
export default function DateComponent({ dateString }) {
  const [date, setDate] = useState(dateString ? parseISO(dateString) : null);
  useEffect(() => {
    if (!date) {
      setDate(new Date());
    }
  }, [date]);
  return date && <time dateTime={date}>{format(date, "LLLL d, yyyy")}</time>;
}