1. Please check this image for more detail (https://www.dropbox.com/s/y317vsubaqq6oyt/Screenshot%202018-03-16%2011.48.22.png?dl=0). You need to choose Custom Format on Post Date Format option.
2. I think this problem will not affect the current view counter on your website because this is number formatting issue. But if you find any strange thing in there you can ask me to do further investigation on your website.