ottoelflaco,
Using Joinkeys for a such task is an overkill as you are performing an actual sort when it is not needed. And even though english is not your strong language, I suggest that you do not show this condescending attitude with the people who are trying to help.
Either way here is a job which will give you the desired results. I also added a few checks like setting an RC=4 when the timestamp file is empty and we wouldn't even execute the next step.
//STEP0100 EXEC PGM=SORT
//SYSOUT DD SYSOUT=*
//SORTIN DD DISP=SHR,DSN=Your Input FB 26 byte file
//SORTOUT DD DSN=&&S,DISP=(,PASS),SPACE=(TRK,(1,1),RLSE)
//SYSIN DD *
OPTION COPY,STOPAFT=1,NULLOUT=RC4
INREC BUILD=(C'TSTMP,C''',1,26,C'''',80:X)
//*
//STEP0200 EXEC PGM=SORT,COND=(4,EQ,STEP0100)
//SYSOUT DD SYSOUT=*
//SYMNAMES DD DISP=SHR,DSN=&&S
//SORTIN DD DISP=SHR,DSN=Your Input FB 92 byte file
//SORTOUT DD SYSOUT=*
//SYSIN DD *
OPTION COPY
INCLUDE COND=(66,26,CH,GE,TSTMP)
//*
If you insist on using Joinkeys , I would suggest that you use the following control cards which are far more efficient than what you have
//SYSIN DD *
OPTION COPY
JOINKEYS FILES=F1,FIELDS=(93,1,A),SORTED,NOSEQCK
JOINKEYS FILES=F2,FIELDS=(27,1,A),SORTED,NOSEQCK
REFORMAT FIELDS=(F1:1,92,F2:1,26)
INCLUDE COND=(66,26,CH,GE,93,26,CH)
INREC BUILD=(1,92)
//*
//JNF1CNTL DD *
INREC OVERLAY=(93:C'1')
//*
//JNF2CNTL DD *
INREC OVERLAY=(27:C'1')
//*
