The last day of the first semester of the 2008-2009 academic year was January 18th, 2009, which also happened to be a Sunday.
That Sunday marked Zheng Qing's twentieth since arriving at First University, as well as his twentieth time attending the class meeting of Astronomy Class 08-1.
It was during this meeting that Zheng Qing belatedly realized that he had apparently gotten the dates mixed up.
"The final exams are already over, whether you did well or poorly, the grades are set in stone, with no room for alteration... Of course, if any of you manage to go further than a Big Wizard, travel back in time to this semester, and still have the interest to change your exam papers, then I take back what I just said."
At the podium, Old Yao held his pipe, smiling as he delivered the end-of-term summary, interspersing his speech with quips that sounded playful but were actually quite cutting.
A subdued, tactful chuckle spread through the classroom.
