convert date of death to next Yahrzeit date

[probalroy]

Which function/procedure of JewishCalendar gives Yahrzeit(the anniversary of the death)? Please add code snippet if possible.

[probalroy]

I tried to use function GetJahrZeitFromGregorianDateInJewishYear by passing Gregorian date of death and current Jewish year. It does not do anything other than formatting the passing Gregorian date. This function suppose to returns JahrZeit in a jewish year (from gregorian date). Please help.