title: Filter table based on a specific date plus 7 days
body: <p>I have a table containing a date field (from 1 March 2020 to now) that I need to filter to a specific date and the previous 6 days to give complete week's data.  So if I chose 30 March I'd get a table of 24 March to 30 March.  If I then chose 31 March the table would show 25 March to 31 March.</p>
  <p>I can use a date slicer to choose a range of dates but I want to be able to pick a single date, with Power BI automatically selecting the earlier date.</p>
  <p>Any pointers much appreciated.</p>
  <p>Mark.</p>