function SubtractYearMonthFromDateTime(Value: TDateTime;
      YearMonthInterval: TEDBYearMonthInterval; YearMonthIntervalType:
      TEDBYearMonthIntervalType): TDateTime

 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.