📅 Date Distance JavaScript function (i.e. "3mo ago", "5d until")

date-distance.html

<pre id=o></pre>
<script>
const TIME = [1e3, "s", 6e4, "min", 36e5, "hr", 864e5, "d", 2592e6, "wk", 2592e6, "mo", 31536e6, "yr"];

const dateDistance = dateStr => {
  const now = new Date().getTime();
  let diff = now - new Date(dateStr).getTime();
  let agoOrUntil = " ago";
  if (diff < 0) { agoOrUntil = " until"; diff = Math.abs(diff); }
  for (let i = 12; i >= 0; i-=2) {
    const t = TIME[i];
    if (diff >= t) return ~~(diff / t) + TIME[i + 1] + agoOrUntil;
  }
  return diff + "ms" + agoOrUntil;
};
o.innerHTML = dateDistance("2023-02-27T04:01:00.497Z");
</script>