Your bankruptcy filing date (July 2011) is the date the official paperwork was filed that opened your case in bankruptcy court, while the bankruptcy discharge date (September 2011) is the date you were released from personal liability for debts included in the bankruptcy. (speakingofcredit.com)
This is not to be confused with the bankruptcy filing date. (fha.com)
The completion form must be filed with the court no later than 15 days after your bankruptcy filing date. (betterbankruptcy.com)