open-ended date ranges for dataset descriptions

Hi DXWG,

Is the topic of open-ended date ranges under consideration anywhere in this
WG, or already in the wider DCAT community? It has cropped up in the
context of Google's dataset search efforts, and digging around I see it was
discussed inconclusively in the Schema.org W3C Community Group back in
2016. The rough conclusion then seemed to be that extensions to ISO 8601
were needed; reading around again today it seems that might happen via the
next version of the ISO spec. Does anyone have a good feel for the issues
and current best practices?

Schema.org discussion on this is in
https://github.com/schemaorg/schemaorg/issues/1365#issuecomment-369703879

Dan