Customer exit variable fiscal year

Hi All,

I have this requirement where, when user enters a date, he should get values for that whole fiscal year. Means if user enters 2015.25.01, he should get the values from starting of the fiscal year i.e April 1st 2014  to 2015.25.01. I know this is a standard requirement, but i am new to ABAP, so can anyone give me a pseudo code please? It would be really helpful.!!

Thanks,

Karthik