I initially tried to create this as a Calculated Column. But, of course, they don't like [Today] as a variable. I'm trying to populate a column with a number that is a calculation based upon a date someone enters into another column. So the calculation would be:
[Today] - [PastDate]
With the impossibility of creating this in a Calc Column, I'm now looking at a workflow for this (using Nintex, of course). How would I go about doing this calculation in a workflow (since that seems to be my only option) ?