Leave Calculation

Dear Friends,

                          We found the calculation procedure in CA CLUB but it says total period served (365*3.5) less no. of leaves taken excluding weekly holidays. My question is if I take leave in December and Janaury what is my total leave taken. Is it 31+31 days or only working days in those months excluding saturdays & sundays ( 23+23)? Also if there was a public holiday or office was closed during those 2 months do i have to reduce such days from my total leaves taken?

Thanks in advance.