The following mfsort command transforms records containing a field of format cyymmdd to the format yyymmdd.
Sort C'cyymmdd'
SORT FIELDS=(1,7,BI,A) * sort C'cyymmdd'
use mfs110a.in org ls record (f 40)
* Transform C'cyymmdd' to C'yyyymmdd'
OUTFIL OUTREC=(1,1,CHANGE=(2, * change C'c' as follows:
C'0',C'19', * C'0' to C'19'
C'1',C'20', * C'1' to C'20'
C'2',C'21'), * C'2' to C'21'
NOMATCH=(C'99')
2,6) * copy C'yymmdd'
give sortout.dat