I just saw this thread and got completely confused.
[What is the "s" at the end of some words and where does it go when talking about multiples?](https://ell.stackexchange.com/questions/173615/what-is-the-s-at-the-end-of-some-words-and-where-does-it-go-when-talking-about)

> 
> Since the subject remains Sunday, the verb remains works (3rd-person
>  singular present).
> 
> 
> 

How can a day of the week be third person singular?

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Please note, I was taught English by reading good books (this was how UK schools worked in the 70s and 80s), so despite being able to talk/write good English (when I remember) my understanding of why is 0. 

I follow most of the answers but this was simply a WTF moment.