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How to determine the date of acquisition of a real estate property in India for capital gains purpose? - agreement of sale of property in india

I booked a flat under construction in India in June 2005. The agreement or the deed was registered with the authorities, while Govt. I paid the builder in installments over the construction and delivery schedule is based was published in August 2007. Actually come into possession / keys of the apartment building in October 2008. I intend to buy the house in June 2010. I want to know the impact of taxes if the sale is the short-term capital gains or long term to win? Or in other words, what is the date of acquisition of property in this scenario? This is the day when the reserved apartment (contract and / or registration, etc.) or the date of the final payment was made, or the day when he actually recovered?
Guru's please help.
CheeseChaser