what is the {start time} for {Jean-Jacques Rousseau} has {spouse} as {Thérèse Levasseur} ?
Jean-Jacques Rousseau married Therese Levasseur on what date?
When did Jean-Jacques Rousseau marry Thérèse Levasseur?
SELECT ?u WHERE { ?s property:start_time ?u . ?s property:spouse resource:Thérèse_Levasseur . resource:Jean-Jacques_Rousseau property:spouse ?s }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q6527> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P26> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q440771> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q6527 p:P26 ?s . ?s ps:P26 wd:Q440771 . ?s pq:P580 ?value}