Date operation in SORT JCL

I tried to add number of days to date using sort JCL. But getting below error every time I try date operations this way.

SORT106E: ***************************                                                                                                
          Field formats improperly specified

Here the sample that I tried.

//STEP0100 EXEC PGM=SYNCSORT
//SYSOUT DD SYSOUT=*
//SORTIN DD *
20221003
//SORTOUT DD SYSOUT=*
//SYSIN DD *
SORT FIELDS=(1,8,CH,A)
OUTREC FIELDS=(1,8,9,8,Y4T,ADDDAYS,+5,TOJUL=Y4T)
//*