VMS Help DCE_SECURITY, Admin Intro, DCE$IMPORT, IMPORT, Data Qualifiers, /GOOD_SINCE_DATE=date  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /GOOD_SINCE_DATE=date

    Specifies the date and time that the account was known to be in an
    uncompromised state.

    If not specified, the Good Since Date is set to the current date
    and time.