VMS Help SHOW, CLUSTER, Qualifiers, /ENDING  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /ENDING=time

    Specifies the time that the SHOW CLUSTER session is to end. You
    can specify an absolute time, a delta time, or a combination
    of the two. Observe the syntax rules for time values described
    in the OpenVMS User's Manual or the online help topic DCL_Tips
    (subtopic Date_Time).

    Use this qualifier with the /BEGINNING and /OUTPUT qualifiers to
    run SHOW CLUSTER without direct user intervention.

    You can specify time as absolute time expressed as [dd-mmm-
    yyyy[:]][hh:mm:ss.cc], or a delta time expressed as [dddd-
    ][hh:mm:s.cc], or a combination of the two. Observe the syntax
    rules for time values described in the OpenVMS User's Manual or
    the online help topic DCL_Tips (subtopic Date_Time).