title: Deserialize Sendbird message CreatedAt data
body: <p>I am trying to get the dates of the message send date in String format from sendbird messages, but don't know how to deserialize the messages.</p>
  
  <p>currently I am just getting a mess of numbers like follows:</p>
  
  <pre><code>1506267806611
  </code></pre>
  
  <p>I currently store the serialized date in the variable below, but can't figure out what's needed to deserialize in swift 3</p>
  
  <pre><code>var msgDate = userMessage.createdAt
  </code></pre>