title: How to sum two times with milliseconds?
body: <p>Is there any way to sum two times with milliseconds like this:</p>
  
  <pre><code>00:01:02.73
  00:03:03.01
  </code></pre>
  
  <p>to one? </p>
  
  <p>the result should be like this:</p>
  
  <pre><code>00:04:05.74
  </code></pre>
  
  <p>format is simple "<code>hours:minutes:seconds.milliseconds</code>"</p>
  
  <p>If yes, how?</p>