seconds to word js

function toWords(seconds) {
  var numyears = Math.floor(seconds / 31536000);
  var numdays = Math.floor((seconds % 31536000) / 86400); 
  var numhours = Math.floor(((seconds % 31536000) % 86400) / 3600);
  var numminutes = Math.floor((((seconds % 31536000) % 86400) % 3600) / 60);
  var numseconds = Math.floor((((seconds % 31536000) % 86400) % 3600) % 60);

  return numyears + " years " + numdays + " days " + numhours + " hours " + numminutes + " minutes " + numseconds + " seconds";
}