Look up dates in event study, +/- 10 days surrounding announcement

Hi,

I have a dataset with stock prices from 2007-2010 and several event dates that occurs are random times within this dataset. Does anyone know how to make excel display the stock returns on e.g. 120 days prior to and 10 days after the event? (given the event date)
I'm gonna do this for 100 events, so it would save me a lot of time to fix this with a formula!

Attached are the doucment