title: Power BI - show data per month
body: <p>I have two columns I'm trying to display. The first one is <code>Close date</code> and the other one is <code>Open data</code>. I need to count closed per month and opened per month and put them into a stacked chart. The issue is that close / open month are not the same. </p>
  
  <p>To explain it better, I have included a quick extract:</p>
  
  <pre><code>    CLOSE_DTTM  OPEN_DT
  01/08/2018  24/05/2018
  01/08/2018  31/05/2018
  02/08/2018  12/07/2018
  02/08/2018  12/07/2018
  01/08/2018  26/07/2018
  02/08/2018  28/07/2018
  02/08/2018  29/07/2018
  02/08/2018  31/07/2018
  02/08/2018  31/07/2018
  02/08/2018  01/08/2018
  </code></pre>
  
  <p>What should I use for the axis in a stack graph?</p>