title: moment.js set time on existing date is not setting the time correctly
body: <pre><code>let end: Date = new Date();
      let h: string = "13";
      let m: string = "20";
      moment(end).set({ hour: parseInt(h, 10), minute: parseInt(m, 10) });
  </code></pre>
  
  <p>I am trying to set time on an existing date. however the above doe is not setting the time in the date. The time always comes as ...00:00:...</p>
  
  <p>Any idea?</p>
  
  <p>Thanks,</p>