Startdate input problem

[Klaus Fink]

Hi,

these are my first steps in GOOGLEFINANCE with the following problem in catching historical data: 

Stockprice yestereday:

INDEX(GOOGLEFINANCE(B2;"price";(HEUTE()-1));2;2) this works fine

but if I refere the historcal data to a cell like this (HEUTE()-O2) where in cell O2 = 1 like

INDEX(GOOGLEFINANCE(B2;"price";(HEUTE()-O2));2;2)

it will not work

Any solution ?

Thanks

Klaus