please help me; in dire need

problem i have encountered:

I want the price of an index two days back(two trading days) and that too for the 3rd bar (time frame is 5 minute bars)
for eg- if today is 11 aug, i want the close value of minus-3rd bar (i.e. 9:45a.m. on a 5 minute scale) on the date of 9aug.

thanks in advance

please help me; in dire need