You would need to spell field correctly for it to work and you cannot do it
readily with one field (though see
http://www.gmayor.com/formatting_word_fields.htm )

{Mergefield  DATEFIELDNAME  \@ "MMMM " }{Mergefield  DATEFIELDNAME  \@ "d"
\*ordinal }, {Mergefield  DATEFIELDNAME  \@ "yyyy"  }