If the Separate Chart Preparing Sttaion VSKP/BZA has its own CK quota,then you can book the tickets on 11 Jan-2012,otherwise if the PRS Clerk allows the only you can book on 10 Jan.IRCTC wont allow to book.It will prohibit you just before the payment page saying that Tatkal tickets can be booked only 1 day in Advance.