what is the {start time} for {Demi Moore} has {spouse} as {Bruce Willis} ?
What is the wedding date for Bruce Willis and Demi Moore?
When Demi Moore got married to Bruce Willis?
SELECT ?b WHERE { resource:Demi_Moore property:spouse ?r . ?r property:start_time ?b . ?r property:spouse resource:Bruce_Willis }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q43044> .
?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/Q2680> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q43044 p:P26 ?s . ?s ps:P26 wd:Q2680 . ?s pq:P580 ?value}