VMS Help ANALYZE, /ERROR_LOG, Qualifiers, /SINCE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SINCE[=date-time]

    Specifies that only those entries dated later than the stated
    date and time are to be selected for the report. If you specify
    /SINCE without a date and time, the default is TODAY. If you omit
    the /SINCE qualifier, all entries are processed.