what is the {start time} for {Kevin Costner} has {spouse} as {Cindy Costner} ?
When were Kevin and Cindy Costner married?
When did Kevin Costner and Cindy Costner get married?
SELECT ?q WHERE { ?y property:start_time ?q . resource:Kevin_Costner property:spouse ?y . ?y property:spouse resource:Cindy_Costner }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q11930> .
?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/Q21401575> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q11930 p:P26 ?s . ?s ps:P26 wd:Q21401575 . ?s pq:P580 ?value}