int __fastcall SubtractDateFromDateAsYearMonth(System::TDateTime
      FirstValue, System::TDateTime SecondValue,
      TEDBYearMonthIntervalType YearMonthIntervalType)

 In ElevateDB, year-month intervals are Integer values that represent the number of days that have elapsed between two calendar days. Use the TEDBEngine YearMonthIntervalToSQLStr method to convert a year-month interval into a readable string.