/TAPE_EXPIRATION=dd-mmm-yyyy

    Writes a file expiration date other than the current date to the
    file header label of the save set.

    HP recommends that you specify an expiration date whenever you
    create a BACKUP save set on magnetic tape using /REWIND. Daily
    BACKUP tapes should expire in seven days, weekly BACKUP tapes
    should expire in one month, and monthly BACKUP tapes should
    expire in one year.

    Specify the date in absolute time format, according to the rules
    described the OpenVMS User's Manual. If you do not specify an
    expiration date, today's date is written to the volume header
    record when you perform a save operation using /REWIND.