I'm new to October and was wondering if there was some sort of built-in function that checks to see if 2 of the same dates/times are chosen and will throw an error. I'm guessing there isn't based on the digging around I've already done, but since I'm new here I just wanted to make sure. Assuming there isn't, if anyone has any suggestions, I would appreciate it. Thank you!

I think I just figured this out. I've used the "unique" validation rule and this seems to work for me. Just a FYI in case anyone else was wondering.