what is the {point in time} for {Louis Leakey} has {award received} as {Hubbard Medal} ?
On what date did Louis Leakey receive the Hubbard Medal award?
When is Louis Leakey received award of Hubbard Medal
SELECT ?v WHERE { resource:Louis_Leakey property:award_received ?s . ?s property:award_received resource:Hubbard_Medal . ?s property:point_in_time ?v }
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/P166> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q4287207> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q14837 p:P166 ?s . ?s ps:P166 wd:Q4287207 . ?s pq:P585 ?value}