Which is the buying date for an IPO

I have applied for ICICI LOMBARD IPO recently and in Karvy it mentioned that i have been allotted 39 shares and the credit to demat ac in zerodha is mentioned as 26th SEPT 2017. The trading date is 27th Sept 2017. This issue was open from Sept 15,2017 till Sept 19,2017. I bid for allotment on the first day itself which is Sept 15,2017, with cut of price at 661. Can you please let me know the buying date , price ,quantity and isin and the process to update it?

In my opinion, the purchase date will be the date of allotment - 26th September in this case. If you’ve applied at cut-off price, then the allotment price will be 661; ISIN = INE765G01017

Source: http://www.bseindia.com/markets/MarketInfo/DispNewNoticesCirculars.aspx?page=20170925-7

Thank you for your assistance in this regard ,VM1

Hi VM1, Does the buying date take into ac the date when the shares gets transferred to Demat ac or the day when the amount gets debited from our bank ac? The amount has got debited from my bank ac today that is 25 Sept 2017, but the credit to demat ac date is tomorrow 26 Sept 2017.