title: Dynamically filter the date by 6 months from today
body: <p>I basically want to be able to dynamically filter out my chart to display data for the last 6 months. For example, it would show Jan 2019 to June 2019 and in July it would show between Feb 2019 to July 2019 </p>
  
  <p>Presently, I'm using filters. I was thinking of creating a calculated field for the 6 months but there are no functions to help me play with dates.</p>