VMS Help COPY, Qualifiers, /SINCE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SINCE[=time]

    Selects only those files dated on or after the specified time.
    You can specify time as absolute time, as combination of absolute
    and delta times, or as one of the following keywords: BOOT,
    LOGIN, TODAY (default), TOMORROW, or YESTERDAY. Specify one of
    the following qualifiers with the /SINCE qualifier to indicate
    the time attribute to be used as the basis for selection:
    /BACKUP, /CREATED (default), /EXPIRED, or /MODIFIED.

    For complete information about specifying time values, refer
    to the OpenVMS User's Manual or the online help topic DCL_Tips
    (subtopic Date_Time).