humanReadableTimeDiff.js

export default function humanReadableTimeDiff(date) {
  var dateDiff = Date.now() - date;
  if (dateDiff <= 0 || Math.floor(dateDiff / 1000) == 0) {
    return 'now';
  }
  if (dateDiff < 1000 * 60) {
    return Math.floor(dateDiff / 1000) + 's';
  }
  if (dateDiff < 1000 * 60 * 60) {
    return Math.floor(dateDiff / (1000 * 60)) + 'm';
  }
  if (dateDiff < 1000 * 60 * 60 * 24) {
    return Math.floor(dateDiff / (1000 * 60 * 60)) + 'h';
  }
  return Math.floor(dateDiff / (1000 * 60 * 60 * 24)) + 'd';
}