Re: Beware survival bias
I think you have a misprint there. Day of week will be easy to do on a watch (Su-M-T-W-Tr-F-Sa repeats forever, just increment at midnight). Full calendar with leap year calculations is harder to do correctly.
Your premise about do a simple task and do it well still holds (like Unix, there's our tech anglr if watches aren't techy enough!)
Biting the hand that feeds IT
