title: MUI-DataTables does not sort my formatted date
body: <p>I have a data set recieved as response from a API call in which I have the dates in the format of "2020-06-10" which is (YYYY-MM-DD), but I need this to be displayed as "10 June 2020" for which I am using a utility as:</p>
  
  <pre><code>const SPACED_DATE_FORMAT = "DD MMM YYYY";
  
  export const getHyphenatedDate = (dateString) =&gt;
    moment(dateString, "YYYY-MM-DD").format(SPACED_DATE_FORMAT);
  </code></pre>
  
  <p>But now when I pass this data to MUI Datatable implementation and the sort does not work as expected (neither in asc nor in desc), it just get shuffled randomly.</p>
  
  <p>Please suggest how can I achieve both points of display the expected format and the correct sorting on top of it.</p>
  
  <p>Library version used:</p>
  
  <p>"moment": "2.24.0",
  "mui-datatables": "2.14.0",
  "react": "16.13.1",
  "react-dom": "16.10.2"</p>
  
  <p><strong><em>NOTE: If I do not format the dates, the sorting works fine.</em></strong></p>
  
  <p>Sandbox with replicated issues : <a href="https://codesandbox.io/s/objective-golick-8qvzf" rel="nofollow noreferrer">https://codesandbox.io/s/objective-golick-8qvzf</a></p>