title: Sum current and prior year month-to-date to corresponding day of month
body: <p>In the picture, I have a running monthly total at the bottom for THIS YEAR.  I have Last Year already populated.  How can I have LY monthly total only populate to where I am currently today?  </p>
  
  <p><img src="https://i.stack.imgur.com/oHAXZ.jpg" alt="SO25556816 question example"></p>