Either that or Monday *was* 'the day before yesterday,' and it took place on Wednesday. All I remember was Monday was involved. ...I still have crystal-clear screenshots of the visual in my head that reared itself when I was articulating that: a pastel yellow+beige background, with three grey 3:4 boxes in almost 3/4 view-- looked kind of like shallow boxes with a certain embossment about them, it's hard to explain.
An arrow, phasing from black to silver (think Barrier from Undertale) with an outline that phased with it, always the opposing color, arcing slowly upward, from the box at the far right, and into the box at the far left, which was at a slightly lower elevation than the far right box, which in itself was slightly lower than the box in the middle. This represented the calendar, and the 'animation' played out as I was explaining, like something for How It's Made.