I would often forget which day of the week it was before Covid (or at least, I'd be aware that although it was Tuesday, it "felt like" Wednesday). Back then every day was similar as I was going into the office.

Now, working from home, I have time to do different activities at lunchtime or in the evenings. I know which day it is based on my activity (today was pilates!). I still set reminders on my phone in case I forget, though.