def year(self, value=None):
        """
        We do *NOT* know for what year we are converting so lets assume the
        year has 365 days.
        """
        if value is None:
            return self.day() / 365
        else:
            self.millisecond(self.day(value * 365))

        We do *NOT* know for what year we are converting so lets assume the
        year has 365 days.
        
src/diamond/convertor.py