Which poll are you referring to? Not mine, I hope. Because that one closes on OCT 31, i.e. two months earlier.

[EDIT: I see you corrected your post before I posted mine. Well done. But I am leaving this in for the second part below.]

There is no cosmic significance to that end date. I had to provide the number of days when creating the poll. Being a lazy git, I entered "100". By coincidence, the end fell on 2018-10-31.