My wife & I are both retired. So one day is pretty-much the same as all the others. For some reason I'm pretty good at remembering what day it is (& also what's on TV that we typically watch... if anything.) But my wife in particular (& me sometimes too) frequently thinks it's some other day than the one it actually is. When one doesn't have a whole lot going on from one day to the next, I think it's easy to lose track.