Currently, there is no way to 'set it and forget it' for a Custom Date
Range. The belief is that you can select Start of Current Month minus 1
Month and End at Current Day minus 1 Month. This results in subtracting
the full month and not the 28/30/31 days. So, if I were to try to
calculate Prior Month To Date, I would end up with the date range
containing only the first of the previous month - not 1-12 or whatever.
There is a workaround that I can subtract 28/30/31 days from the above
calculated...