Library /sys$common/syshlp/tracehlp.hlb ANALYZE, /BEFORE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    /NOBEFORE
    /BEFORE=[date-time]

    Allows you to analyse data traced before a specified time.  Specify
    an  absolute  date/time  of the form [dd-mmm-yyyy:][hh:mm:ss.cc] as
    defined in the VMS DCL Concepts Manual.