Display date difference from timestamp, "that much time ago" like.

time-ago.js

function timeAgo(time) {
  'use strict';
  var second = 1000,
    minute = second * 60,
    hour = minute * 60,
    day = hour * 24,
    month = day * 30,
    year = day * 365,
    elapsed = Date.now() - time,
    getString = function (value, unit) {
      value = Math.round(elapsed / value);
      return value + ' ' + unit + (value === 1 ? ' ago' : 's ago');
    };
  if (elapsed < minute) {
    return getString(second, 'second');
  } else if (elapsed < hour) {
    return getString(minute, 'minute');
  } else if (elapsed < day ) {
    return getString(hour , 'hour');
  } else if (elapsed < month) {
    return getString(day, 'day');
  } else if (elapsed < year) {
    return getString(month, 'month');
  } else {
    return getString(year, 'year');
  }
}