With ISMA, if the period is somewhat irregular, you'll need to pass
reference dates for the result to make sense. In this case,
dayCounter.yearFraction(Date(2, Mar,2012), Date(26, Feb, 2013),
Date(2,Mar,2012), Date(2,Mar,2013))
will give you 0.989041095890411, which is 361/365;
dayCounter.yearFraction(Date(2, Mar,2012), Date(26, Feb, 2013),
Date(26,Feb,2012), Date(26,Feb,2013))
will give you 0.9863387978142076, which is 361/366; and
dayCounter.yearFraction(Date(2, Mar,2012), Date(26, Feb, 2013),
Date(1,Jan,2012), Date(1,Jan,2013))
will give you 0.98675799086758, which matches 305/366 + 56/365 (the
part in 2012 + the part in 2013).
If you don't pass any dates, the only thing the day counter can do is
take the two passed dates as the start and end of the reference
period, which in this case messes things up.
Later,
Luigi
On Fri, Mar 2, 2012 at 9:13 AM, Dagur Gunnarsson <
[hidden email]> wrote:
> hello,
>
> I am getting strange results with the DayCounter using the
> ActualActual::ISMA day convention.
>
> DayCounter dayCounter = ActualActual(ActualActual::ISMA);
> cout<<setprecision(10)<<" yearfract "<< dayCounter.yearFraction(Date(2, Mar,
> 2012), Date(26, Feb, 2013))<<endl;
>
> gives me :
>
> yearfract 1.0000000000 - Instead of 361/366
>
> Could this be a bug?
>
> regards
> Dagur G
>
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