generate countdown string to a timestamp

countdown-string.js

var cdStamp = 1472301000000;
var cdDuration = cdStamp - (new Date().getTime());
cdDuration = cdDuration > 0 ? cdDuration : 0;
var cdTimes   = [    7,    24,     60,       60,     1000];
var cdUnit    = ['uke', 'dag', 'time', 'minutt', 'sekund'];
var cdUnitEnd = [   'r',   'er',   'r',      'er',     'er'];

var cdResult = cdTimes
  .map((t, i, timeArr) => {
    var unitMulti = timeArr.slice(i, timeArr.length).reduce((a,b) => a*b);
    var timeSubtract = 0;
    if (i > 0) {
        var unitMultiPrev = timeArr.slice(i-1, timeArr.length).reduce((a,b) => a*b);
        timeSubtract = timeArr[i-1] * Math.floor(cdDuration / unitMultiPrev);
    }
    return Math.floor(cdDuration / unitMulti) - timeSubtract;
  })
  .map((t, i) => {
    return t + ' ' + cdUnit[i] + (t > 1 ? cdUnitEnd[i] : '');
  })
  .filter(t => /^[^0]/.test(t))
  .join(' ');
  
console.log(cdResult);