int GetYears() const { return m_years; }
// get number of months
int GetMonths() const { return m_months; }
+ // returns 12*GetYears() + GetMonths()
+ int GetTotalMonths() const { return 12*m_years + m_months; }
// get number of weeks
int GetWeeks() const { return m_weeks; }
// get number of days