DayCounter question regarding ActualActual::AFB

Posted by Dagur Gunnarsson-2 on
URL: http://quantlib.414.s1.nabble.com/DayCounter-question-regarding-ActualActual-AFB-tp254.html

hello,

should the ActualActual::AFB DayCounter method not use 366 in the denominator, when calculation yearFraction, instead of 365 for a period containing 29th of february 2012? At least according to http://en.wikipedia.org/wiki/Day_count_convention#Actual.2FActual_AFB

the following :

DayCounter dayCounter = ActualActual(ActualActual::AFB);

cout<<setprecision(10)

      <<"Yearfraction = "

      <<dayCounter.yearFraction(Date(8, Mar, 2012), Date(17, May, 2012), Date(17, May, 2011), Date(17, May, 2012))<<endl

      <<"Daycount = "<<dayCounter.dayCount(Date(8, Mar, 2012), Date(17, May, 2012))<<endl;

gives

Yearfraction = 0.1917808219   --> 70/365 and not 70/366

Daycount = 70

am i wrong here?

regards

Dagur G

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