My university's system for coursework and timetabling (among other things) had a bug where the time between a scheduled event and the tutor adding our attendance could be displayed incorrectly (i.e. if an event happened Friday 4pm, and the attendance was recorded 10am Saturday, it would display "same day as event" instead of "1 day after event").

This was fixed via an open-source PR on the repositiory for this system, and went live in production today!