The shift rotation that starts on September 17th ends on October 1st. The 2012 calendar book lists the end date as October 8th.
Also, the shift rotations for October, November, December and January, 2013 are incorrect. They end on:
October 1st, 15th; 29th
November 12th; 26th
December 10th; 24th
January 14th; 28th
Please make these corrections in your book.