The film week
Set up the way your building runs.
Flip on Opening and the shift starts before first show. Flip on Close and it ends when your late-show staff clock out. Your theater sets both times once, so you're not typing 11:00 PM forty times a week.
The week runs Friday through Thursday by default, because that's when new titles open, but you can start it on any day. Positions, certifications, opening lead time and close time are all yours to set. UTU adjusts to your building, not the other way around.