/sys$common/syshlp/helplib.hlb NCS Command, Command Qualifiers, /SINCE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /SINCE[=time]

   Use this qualifier with the /LIST qualifier  to  list  only  modules
   inserted into the library after the specified time. You can specify
   an absolute time or a combination of absolute and delta times.  For
   details on specifying times,  see  the DCL Dictionary.  If  you
   omit the  /SINCE  qualifier,  NCS lists  all  the  modules  in  the
   library. regardless of date. If you specify /SINCE without  a  date
   or time, NCS lists only those modules inserted today.