I would just like to add to this post for anyone else - be sure the choice(s) you add have UNIQUE values. I had same issue but went back and looked and saw my new choice's value was same as another choice, thus was not showing.
I know its late, but I think I found the way to do this if you are a sysadmin or can get them to do it for you. First create a report formula and just do the datediff() with any two date fields so you can get it saved initially. The system will aut...
