Quick code snippet for calculating "X days ago" given a specific date, with localized language.

relativetime.ts

const rtf = new Intl.RelativeTimeFormat ("en", {
  localeMatcher: "best fit",
  numeric: "always",
  style: "long",
});

function getDifferenceInDays(fromDate, toDate) {
  const diff = Math.floor( (fromDate - toDate) / (1000 * 60 * 60 * 24));
  return rtf.format (diff, "day");
}

getDifferenceInDays(new Date('2022-05-31T16:33:07.000Z' ), new Date());