output a pretty time string from a given milliseconds time

prettyTime.js

// value in milliseconds
function prettyTime(value){
  var days = Math.floor(value/86400000);
  value = value%86400000;
  var hours = Math.floor(value/3600000);
  value = value%3600000;
  var minutes = Math.floor(value/60000);
  value = value%60000;
  var seconds = Math.floor(value/1000);
  value = value%1000;
  return (
    (days? days + 'd ' : '') + 
    (hours? hours + 'h ' : '') + 
    (minutes? minutes + 'm ' : '') + 
    (seconds? seconds + 's ' : '') + 
    (value? value + 'ms' : '')
  );
}

console.log(prettyTime(500000)); // 8m 20s 
console.log(prettyTime(1000)); // 1s

var start = new Date;

setTimeout(function (argument) {
  // execution time simulated with setTimeout function
  var end = new Date() - start;
  console.log(prettyTime(end));
}, 1234); // 1s 238ms

node package to do the same work:

• [GitHub] sindresorhus / pretty-ms - Convert milliseconds to a human readable string: 1337000000 → 15d 11h 23m 20s