I want to be able to calculate the days between two "dates" however I need it
on a 30 day system. It doesn't run on a true calendar, but always on 30 days.
So essentially between two 1-30 sets I need the amount. I want to include the
first number.

So if I put down in the first cell "23" and the second cell say "8" I need
the total to be 16

Any suggestions?