@CᴏɴᴏʀO'Bʀɪᴇɴ You could use Minkolang by replacing all occurrences of " with "66*2-" and all occurrences of ' with "3$3*", and then putting a " at the beginning and "$O. at the end.
@quartata It's rather obvious in the code, I'll give a hint, the days of the week are stored in an array like such char dayName[8][4] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
To anyone wanting to know the answer, that's what happens when you try to reference an array using a negative index (-1) in C and there's no memory protection :)