CL0N01Factor1+++++++Opcode(E)+Factor2+++++++Result++++++++Len++D+HiLoEq....
 * Determine a LOANDATE which is xx years, yy months, zz days prior to
 * the DUEDATE.
C     DUEDATE       SUBDUR    XX:*YEARS     LOANDATE
C                   SUBDUR    YY:*MONTHS    LOANDATE
C                   SUBDUR    ZZ:*DAYS      LOANDATE
 * Add 30 days to a loan due date
 *
C                   SUBDUR    -30:*D        LOANDUE
 * Calculate the number of days between LOANDATE and DUEDATE.
 * If DUEDATE is after LOANDATE, the value of NUM_DAYS will be positive.
C     DUEDATE       SUBDUR    LOANDATE      NUM_DAYS:*D       5 0
 * Determine the number of months between LOANDATE and DUEDATE.
C     DUEDATE       SUBDUR    LOANDATE      NUM_MONTHS:*M     5 0