Date Created in DTTG?

Is there a possibility to see the creating date in search results and list views in DTTG?

This is super important in understanding the chronology of events in looking at search results. Every writing- and document-app I use (mobile and desktop) shows the creation and modification date in list view. And there is a reason why. Not only if you deal with legal documents.

I do datestamp my document names, but I also get a lot of documents from outside without datestamp in the filename.

No this is not currently possible. Perhaps in a future release.