Example: Year Fraction

The year fraction of a 30/360 year starting 8/1/85 and ending 7/1/86 is returned in this example. 
using System;
using Imsl.Finance;

public class yearfracEx1
{    
    public static void  Main(String[] args)
    {
        DateTime start = DateTime.Parse("8/1/85");
        DateTime end = DateTime.Parse("7/1/86");
        DayCountBasis dcb = DayCountBasis.BasisNASD;
        double yearfrac = Bond.Yearfrac(start, end, dcb);
        Console.Out.WriteLine("The year fraction of the 30/360 period " 
                              + "is " + yearfrac);
    }
}

Output

The year fraction of the 30/360 period is 0.916666666666667
Link to C# source.