IBMi (AS400) fans only : %DIFF BIF - How to add or subtract days from a date field %days(n)

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#IBMiSample


We can use %DAYS to add or subtract to a date.
Hier is an example:

TESTDY.DSPF
     A                                      DSPSIZ(*DS3)
     A                                      CHGINPDFT(UL CS)
     A                                      PRINT
     A                                      CF03(03)
     A*******************************************************
     A*  F01                                                *
      *******************************************************
     A          R F01
     A                                      OVERLAY
     A                                  1 31'PARAMETERS REQUEST'
     A                                      DSPATR(HI)
      *
     A                                  3  8'Insert a date        (yymmdd):'
     A            PPDT00DMY      6Y 0B   + 1EDTCDE(Y)
     A            PPDT0RYMD      6Y 0O    +4EDTCDE(Y)
     A                                  4  8'Insert a date        (ddmmyy):'
     A            PPDT10DMY      6Y 0B   + 1EDTCDE(Y)
     A            PPDT1RYMD      6Y 0O    +4EDTCDE(Y)
     A                                  5  8'Insert a date *ISO (ccyymmdd):'
     A            PPDTISO         L  B   + 1
     A            PPDT2RCYMD      L  O    +2
     A                                  6  8'Insert a date *EUR (ddmmyycc):'
     A            PPDTEUR         L  B   + 1DATFMT(*EUR)
     A            PPDT3RCYMD      L  O    +2
     A                                  7  8'Insert a displacement        :'
     A            PPDSPL         3Y 0B   + 1EDTCDE(K)
      *******************************************************
      *  P00                                                *
      *******************************************************
     A          R P00
     A                                 24  3'F3=EXIT' 
 
TESTDY.RPGLE
      **free
      *************************************************************************
      *  Exampel %days                                                        *
      *************************************************************************
       ctl-opt DFTACTGRP(*NO);
      *
       dcl-f TESTDYFM workstn;
      *
       dcl-s PPDT00YMD zoned(6);
       dcl-s PPDT10YMD zoned(6);
       dcl-s PPEXIT char(1);
      *
       // *********************************************************************
       // PGM start
       // *********************************************************************
       PPEXIT = 'N';
       dow (1 = 1) ;
         write p00;
         exfmt f01;
         if (*in03);
           PPEXIT = 'Y';
           leave;
         endif;
         if (*in03 = *off);
           PPDT0RYMD = %dec(%char(%date(PPDT00DMY:*ymd) +
                    %Days(PPDSPL) :*ymd0):6:0); // from   yymmdd to   yymmdd
           PPDT10YMD = %dec(%date(PPDT10DMY:*ymd):*dmy); // ddmmyy to yymmdd
           PPDT1RYMD = %dec(%char(%date(PPDT10YMD:*ymd) +
                    %Days(PPDSPL) :*ymd0):6:0); // from   yymmdd to   yymmdd
           PPDT2RCYMD = PPDTISO + %Days(PPDSPL);    // from ccyymmdd to ccyymmdd
           PPDT3RCYMD = PPDTEUR + %Days(PPDSPL);    // from ccyymmdd to ccyymmdd
         endif;
       enddo;
       *inlr = *on; 

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