double Calendar::Years(const Calendar & calendar)
{
Calendar * prior = this;
Calendar * after = (Calendar*)&calendar;
if (calendar < (*this))
{
prior = (Calendar*)&calendar;
after = this;
}
double years = prior->CalendarMonthsRemaining()/Time::MonthsPerYear;
years += ((prior->Year+1)<after->Year)?after->Year-(prior->Year+1):0;
if (prior->Year == after->Year)
years -= after->CalendarMonthsRemaining()/Time::MonthsPerYear;
else
years += after->CalendarMonths()/Time::MonthsPerYear;
return (calendar < (*this))?years:-years;
}
double Calendar::Months(const Calendar & calendar)
{
Calendar * prior = this;
Calendar * after = (Calendar*)&calendar;
if (calendar < (*this))
{
prior = (Calendar*)&calendar;
after = this;
}
double months = prior->CalendarMonthsRemaining();
for (int year=prior->Year+1;year<after->Year;++year)
months += Time::MonthsPerYear;
if (prior->Year == after->Year)
months -= after->CalendarMonthsRemaining();
else
months += after->CalendarMonths();
return (calendar < (*this))?months:-months;
}