The absolute literal deadline is 11:59 pm on October 16.
But, and I think I said this before, all the bankruptcy attorneys I know are saying that they are not taking new clients after September 30.
If you are thinking of filing pro se, I strongly encourage you to reconsider. If you don't dot the i's and cross the t's exactly right, you will get bounced and then be up that proverbal creek of excrement with no motive device.