what is the {start time} for {Josephine Baker} has {country of citizenship} as {France} ?
What date did Josephine Baker become a citizen of France
When did Josephine Baker become a citizen of France?
SELECT ?o WHERE { ?c property:country_of_citizenship resource:France . resource:Josephine_Baker property:country_of_citizenship ?c . ?c property:start_time ?o }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q151972> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P27> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q142> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q151972 p:P27 ?s . ?s ps:P27 wd:Q142 . ?s pq:P580 ?value}