Hello TheVodkaDude,
Had to edit this as it just occurred to me that you are a MAC user so none of this may apply!
I'm new to this forum. I've an answer to your question that may be of some use to you. If not then, my stab was in vain!
I have Excel 2010 which may make a difference. I tried two things.
First, I subtracted the dates and subtracted one for the last night occuppied:
Then used SUMIF to extract dates the rooms were occupied.
I've attached the file (at least I hope I have) to clarify.
Here's hoping it worked!
Bookmarks