what is the {start time} for {Ingvar Kamprad} has {spouse} as {Kerstin Wadling} ?
When did Ingvar Kamprad and Kerstin Wadling wed?
When did Ingvar Kamprad marry Kerstin Wadling?
SELECT ?w WHERE { ?d property:spouse resource:Kerstin_Wadling . ?d property:start_time ?w . resource:Ingvar_Kamprad property:spouse ?d }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q216932> .
?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/Q47519864> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q216932 p:P26 ?s . ?s ps:P26 wd:Q47519864 . ?s pq:P580 ?value}