How do I automatically check a checkbox if [DATE] = the prior business day and uncheck the checkbox if [DATE] <> the prior business day?

Question ... can i use this to automatically unchecked a checkbox? I need to create a checkbox field that has to be reset to unchecked the first of every month.

I suggest that you post this as a new question. You can reference this thread in your post. In that question, clarify if you want to have s data entry checkbox field get reset or a formula checkbox field to be reset (which does not make much sense)