title: 'Get 30 days ago' and 'one year ago' date in freemarker
body: <p>I am getting current date using below code : </p>
  
  <pre><code>&lt;#assign aDateTime = .now&gt;
  &lt;#assign aDate = aDateTime?date&gt;
  current date: ${aDate?iso_utc}
  </code></pre>
  
  <p>How to 'get 30 days ago' and 'one year ago' date using freemarker ?</p>