what is the {start time} for {Dubrovnik} has {country} as {Austrian Empire} ?
At what point in the Austrian Empire Dubrovnik become a country?
When did Dubrovnik become a country in the Austrian Empire?
SELECT ?e WHERE { ?c property:start_time ?e . ?c property:country resource:Austrian_Empire . resource:Dubrovnik property:country ?c }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1722> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P17> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q131964> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q1722 p:P17 ?s . ?s ps:P17 wd:Q131964 . ?s pq:P580 ?value}