title: How to add minutes in moment js with a HH:mm format?
body: <p>How do I add minutes to this. I followed the documentation but somehow this is not working:</p>
  
  <pre><code>var hours = randomIntFromInterval(0,23);
  var minutes = randomIntFromInterval(0,59);
  var time = moment(hours+':'+minutes,'HHmm').format("HH:mm");
  time.add(7,'m');
  </code></pre>
  
  <p>Only the last line is not working, but should be right according to the documentation. What am I doing wrong?</p>