/BEFORE=time

    Selects files dated earlier than the date and time you specify.

    Specify the date and time as a delta time or as an absolute time
    using the format [dd-mmm-yyyy[:]][hh:mm:ss.cc]. You can also use
    one of the following reserved words to specify the date and time:

    BACKUP      The BACKUP date of the file written by a previous
                BACKUP/RECORD operation (available only on Files-11
                Structure Levels 2 or 5 volumes)
    TODAY       The current day, month, and year at 00:00:00.0
                o'clock
    TOMORROW    24 hours after midnight last night
    YESTERDAY   24 hours before midnight last night

    The /BEFORE qualifier is not valid in incremental restore
    operations.