/sys$common/syshlp/helplib.hlb LICENSE, MODIFY, Qualifiers, /TERMINATION_DATE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /TERMINATION_DATE=date

    Date at which the product license is to be terminated. If
    your PAK supplied a license termination date, LMF uses the
    earliest date to determine the termination date. The date must
    be presented in the standard OpenVMS format: dd-mmm-yyyy. If
    you want to restrict a product from further use today, enter
    yesterday's date; LMF terminates the license at the end of the
    day specified.