title: Converting sql number to date
body: <p>I have a table for an events system that contains what I believe to be the start and end date of the event in number format.</p>
  
  <p>I have tried multiple methods to convert the number but none work.</p>
  
  <p>For example, I have the column 'event_start_ts' and the number</p>
  
  <pre><code>1488621600
  </code></pre>
  
  <p>and that should equal the date</p>
  
  <pre><code>04-03-2017
  </code></pre>
  
  <p>How do I convert this?</p>
  
  <p>Thanks</p>