title: Easy way to get a readable date from a long (timestamp) in scala
body: <p>My question is simple</p>
  
  <p>If I do:</p>
  
  <pre><code>var start = System.currentTimeMillis
  </code></pre>
  
  <p>I get:</p>
  
  <pre><code>start: Long = 1542717303659
  </code></pre>
  
  <p>How should I do to get a string looking to something readable for a human eye?:</p>
  
  <p>ex: "20/11/2018 13:30:10"</p>