Completly overhauls NPC schedule. Students and professors go to classes, dinners, their common rooms, hogsmeade on weekends, vendors close their shops at night and many things more. It also populates the castle a bit.
Automatically sets the in-game season to match the in-game month. i.e. Dec-to-Feb=Winter, Mar-to-May=Spring, etc. Also displays the time and date on-screen if you press ALT-e.