what is the {start time} for {Richard Attenborough} has {spouse} as {Sheila Sim} ?
When did Richard Attenborough and Shiela Sim get married?
What date did Richard Attenborough marry Sheila Sim?
SELECT ?t WHERE { ?c property:start_time ?t . resource:Richard_Attenborough property:spouse ?c . ?c property:spouse resource:Sheila_Sim }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q51506> .
?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/Q4419444> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q51506 p:P26 ?s . ?s ps:P26 wd:Q4419444 . ?s pq:P580 ?value}