Function unit

lib/utils.js:72–74

(name, n)

    , day = hour * 24;

  function unit(name, n) {
    return n + ' ' + name + (1 == n ? '' : 's'); 
  }

  if (diff < second) return unit('millisecond', diff);
  if (diff < minute) return unit('second', (diff / second).toFixed(0));