what is the {point in time} for {Jean Cocteau} has {position held} as {President of the Jury at the Cannes Festival} ?
Jean Cocteau was the President of the Cannes Festival jury when?
When was Jean Cocteau the President of the Cannes Festival jury?
SELECT ?p WHERE { ?a property:point_in_time ?p . ?a property:position_held resource:President_of_the_Jury_at_the_Cannes_Festival . resource:Jean_Cocteau property:position_held ?a }
select distinct ?value  where {
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?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P39> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q23958341> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q83158 p:P39 ?s . ?s ps:P39 wd:Q23958341 . ?s pq:P585 ?value}