Oh, it matters what day it is in THIS house, trust me! Bob has had the house to himself for 13 years, and he has a routine with a capital "R".
Monday, Thursday, and Saturday he washes towels and bath mats. We're talking 5:30 in the morning, when I'm getting breakfast ready, he's reaching around me for the hand towel so he can get his laundry started.
Tuesday and Friday are vacuuming days. I can tell if it's Tuesday or Friday, because around 6:00 a.m. Bob says to the cats "You'd better hide, I'm gonna get out the big gun", and he starts picking up shoes and stuff off the floor so he can get started.
And so on. Certain days to clean certain cat boxes, certain days for the recycling, etc. I sound like I'm making fun of him, don't I? Well, I'm not, God bless him. But it does matter what day it is!