IT Exemption u/s 24 of IT Act

Dear Forum Members
My Case is regarding a New (Under Construction) Flat I booked in June 2010 with a builder.

The flat costed 40 Lacs at the time of booking for which i took a loan of 30 Lacs under CLP (Construction Linked Plan) The builder is yet to offer me possession of the flat. i'm also paying pre emi on the flat.

Now I read about Section 24 of IT Act (regarding interest waiver). The Act says if the possession is not happening in 3 years than instead of 1.5 lacs interest waiver i'll b given a flat waiver of 30k only. The act no where mentions about the complete loan disbursement or date of first disbursal.

so my Query is Loan Disbursal Date of first installment or last installment will b considered for the calculation of Pre EMI waiver.