I have a need to calculate working days until an item is due or working days past due. I also have to exclude holidays and the holidays may or may not apply to that item based on what project the holiday applies to. I had created a holiday calendar and initially created the field as a computed field that would display an empty div tag and I would use code to do the calculations and display it inside the div tag using javascript. This worked fine when the items were in a single list. Due to other requirements I needed to create a single list for each department. Now I still need to display this info but I am not sure how to do it.
So, can a custom field do this or is there some other way to display this data?