var
  StartDate, EndDate : TDateTime;
  DiffDate : Double;

  year1,month1,day1 : Word;
  year2,month2,day2 : Word;
begin
  StartDate := StrToDate('2005-05-15'); <-+-- 이부분은 시스템 제어판의 국가별 설정의 날짜 형식에 따라 사용방법이 달라집니다.
  EndDate := StrToDate('2003-07-01'); <-+
  ShowMessage('StartDate = '+DateToStr(StartDate));
  ShowMessage('EndDate = '+DateToStr(EndDate));

  DiffDate := EndDate - StartDate;
  ShowMessage('EndDate - StartDate = ' + FloatToStr(DiffDate)+' days');

  DecodeDate(StartDate, year1, month1, day1);
  DecodeDate(EndDate,   year2, month2, day2);

  ShowMessage(IntToStr(year1 - year2)
            + '년'
            + IntToStr(month1 - month2)
            + '개월'
            + IntToStr(day1 - day2)
            + '일');