title: Joda time - minus Duration from DateTime
body: <p>I've searched around but cannot find an answer for this.</p>
  
  <p>I have a Duration:</p>
  
  <pre><code>Duration dur = Duration.ofMillis(50);
  </code></pre>
  
  <p>and I have a DateTime:</p>
  
  <pre><code>DateTime dt = DateTime.now();
  </code></pre>
  
  <p>How do I subtract the Duration from the DateTime? I can see the method <code>DateTime.Minus(ReadableDuration)</code> so I thought I could do this:</p>
  
  <pre><code>DateTime dt = DateTime.now().minus(dur);
  </code></pre>
  
  <p>But apparently Duration does not extend ReadableDuration.</p>