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