Modifies the time value specified with the /BEFORE or /SINCE
    qualifier. The /MODIFIED qualifier selects files according to
    the dates on which they were last modified. This qualifier is
    incompatible with the other qualifiers that allow you to select
    files according to time attributes: /BACKUP, /CREATED, and
    /EXPIRED. If you specify none of these four time modifiers, the
    default is /CREATED.