need a functional module with fiscal year

Hi,
I have a scenario where I need to capture all factory working days in a given fiscal year.
For eg: If I give a begin date as 01/01/2013 and end date as 30/01/2013 then it should give me starting from Jan 1st to 30th Jan, MON to FRI all the working days.
I am not sure we have direct FM's for this. Please advise.

Thanks,

Sravya.