Foreign exchange gain or loss

Hi friends,

We raise invoice to foreign comp,in turn money would be deposited into EEFC a/c in India

Suppose

we raise invoice on 01.05.11 - Exchange rate 45.89

Customer deposit the money directly into EEFC a/c  on 01.06.11 - Exchange rate 45.00

We convert that foreign currency into indian currency on 8.06.11  - Exchange rate 46.00

Which date difference in exchange rate do we need to consider for calculating foriegn exchange gain or los?