VMS Help DECnet-Plus, DCL Commands, COPY, Qualifiers, /MODIFIED  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MODIFIED

    Qualifier type:        Input file qualifier

    Supported file types:  Local

    This qualifier selects files according to the dates on which they
    were last modified. It is relevant only with /BEFORE or /SINCE and
    is incompatible with /BACKUP, /CREATED, and /EXPIRED.

    Default value:         Creation date