The WikidataItem is current assumed to be represented by a standard date format:
However, Wikidata dates can be of a form like "1810s" or "17th century": https://www.wikidata.org/wiki/Help:Dates
As it stands, these data are not imported. It does not break the import process. See the Anne Carrington House subject in the MapRVA instance for reference (Wikidata page).
The WikidataItem is current assumed to be represented by a standard date format:
However, Wikidata dates can be of a form like "1810s" or "17th century": https://www.wikidata.org/wiki/Help:Dates
As it stands, these data are not imported. It does not break the import process. See the Anne Carrington House subject in the MapRVA instance for reference (Wikidata page).