Hi Steve, hi Joe,
this date is file specific, so if you have a document with several files, each file has its specific date.
Until version 6.12 file specific data was stored in the XML files mentioned by Joe. Since version 7.0 DocuWare stores this data in the database for newly stored documents. If you have the option "Backup index data to storage location" enabled, then this data is again in a file near the document, but with a different structure.
You can access this data with the DocuWare platform with this URL: https://[ServerURL]/DocuWare/Platform/FileCabinets/[FileCabinetGUID]/Sections?docid=[DocID]
So this would be the consistent way to get this property from DocuWare as this works across versions and also on premises and Cloud