Disney's block-out calendar is updated monthly with a new month so that it is usually showing dates no more 11 to 12 months from any given date, so curently it is showing only through Sep 2017. I am guessing the end date will be Jan 1, 2018, the New Years holiday. It was Jan 1 this year. It is Jan 2, 2017 because that is the official holiday since Jan 1 is on a Sunday. Start date not clear but this year will be Dec 19, making 15 total days through Jan 2, so I suspect it will be Dec 18, 2017.