title: Groovy render as JSON java.sql.timestamp in In JavaScript milliseconds not displayed
body: <p>I have a <code>java.util.ArrayList</code> which contains the red marked value:<img src="https://i.stack.imgur.com/K5iCf.jpg" alt="enter image description here"></p>
  
  <p>if I render it with <code>render relations as JSON</code> then in JavaScript the value is the following:
  <img src="https://i.stack.imgur.com/hTLiz.jpg" alt="enter image description here"></p>
  
  <p>The milliseconds are gone, if I understand it right the value of <code>receiveDate</code> is a string so there is no way to parse it to another format.</p>
  
  <p>Is there a way to render the value that the milliseconds are not gone ?</p>