I am trying to create a field that would show the number of days until X event. Specifically, I'm trying to measure how many days I have left to pay an invoice before the date to get any invoice discounts for early payment has passed. So, if I have three days until the discount due date, the field should show "3". If today is the discount due date, the field should be "0". If the discount due date has already passed, I'd like the field to say "Exp".
I've gotten the field to calculate the countdown by doing a DiffInDays calculation. I am having trouble getting the field to show the values as described above. I thought about creating a separate field and writing workflows to set the values, but didn't know if there was an easier way.