There are three subroutines which might be system dependent. They are all in the directory 21b/source/local:
    SUBROUTINE CLOCK1(T)    FUNCTION RAND(IR)      SUBROUTINE JOBDAT(JOBTIM)
    IMPLICIT NONE           IMPLICIT NONE          CHARACTER*20 JOBTIM
    REAL*8 T,SECOND         INTEGER IR             CALL TIME(JOBTIM(1:8))
    T=SECOND()              REAL*8 RAND            JOBTIM(9:9)='('
    RETURN                  RAND=RAN(IR)           CALL DATE(JOBTIM(10:18))
    END                     RETURN                 JOBTIM(19:20)=') '
                            END                    RETURN
                                                   END