what is the {start time} for {Artie Shaw} has {spouse} as {Evelyn Keyes} ?
What was the date Artie Shaw married Evelyn Keyes?
Since when was Artie Shaw married to Evelyn Keyes?
SELECT ?m WHERE { ?w property:start_time ?m . ?w property:spouse resource:Evelyn_Keyes . resource:Artie_Shaw property:spouse ?w }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q320065> .
?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/Q253328> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q320065 p:P26 ?s . ?s ps:P26 wd:Q253328 . ?s pq:P580 ?value}