My aunt sold a vacant plot of land and wishes to invest Rs.50 lakhs in LTCG tax saving bonds of REC & NHAI. She received the token amount of Rs. 5 lakhs on 16th May 2012. An "Agreement for Sale" was entered into on 22nd May 2012, wherein it was mentioned that the balance amount of Rs.90 lakhs will be given to my aunt within 31st July,2012. The "Sale Deed" was finally executed on 25th July 2012. This document was registered with the Sub-Registrar after payment of the necessary stamp duty on the same date, that is, 25th July 2012. The balance amount of money was also received by my aunt around this date. I wish to know what is the actual date of transfer within 6 months of which investment has to be made in 54EC LTCG tax saving bonds to save tax.