TRichView.com

Is there a possibility in RichViewEdit to insert (rtf-)fields like the date-field in word and to switch between value mode and code mode and to export the document so that those fields are display in word as well as in RichViewEdit?

Sorry, no. RTF fields are not supported.
There are several ways to implement fields ( http://www.trichview.com/forums/viewtopic.php?t=8 ), but they all will be exported to Word as text.