That's midnight in New Zealand where Microsoft is hoping to piggy back off of the love of the world for Hobbits to polish this turd. We can't think of any other reason. Can you?
Brandon LeBlanc, on the official Windows Blog, went all ecstatic and cheerleadery to get us to mark our calendars:
I know a lot of folks are eager to find out when they will be able to get Windows 8.1. I am excited to share that starting at 12:00am on October 18th in New Zealand (that’s 4:00am October 17th in Redmond), Windows 8.1 will begin rolling out worldwide as a free update for consumers on Windows 8 through the Windows Store. Windows 8.1 will also be available at retail and on new devices starting on October 18th by market. So mark your calendars!
This is a bit of a kick in the pants, but you have to say it: no one cares about Windows! Except IT guys in big companies who are beginning to pray for Klaatu to shut down all of their systems so, they don't have to upgrade jack on any PC ever again.
You know I am right.