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.