kevin answered:
The same way the ancients did — TV shows.
thistumblerhasane answered:
The names of the days will change to match the memes i.e. yesterday was Yourself, today is Sexy Sex. People adapt. It’s evolution.
lidmo answered:
Days Of The Week underwear should tell you. Unless of course, the laundry has not been done…then you’re screwed or it means it’s Sunday.