Some students at my university created a website to turn your timetable into a file that could be imported into a calendar app by screen scraping the timetabling website. The University actually helped out with hosting it and providing access to their SSO system. Win win.
I've done the same at my university, and they've mostly turned a blind eye to it. The timetabling department expressed concerns about students relying on timetables that are outside the university's direct control but have thankfully not taken any action.
