Is there an elegant way to get data out of wikidata in a format that you can then fill back into another Wikibase without the pain of such conversions (like splitting coordinates, changing columns, changing the prefixes...)

Question 2 is related: When you extract dates with the QueryService that will change just years like 1971  from 1971-00-00 into 1971-01-01 dates. I felt unable to tell whether such a date was just a year or actually a January 1 entry. Is there a way to get the exact date as it has been put in to Wikibase back from the QueryService?