what is the {point in time} for {John Frederick William Herschel} has {award received} as {Copley Medal} ?
Give me the date that John Frederick William Herschel received the Copley Medal.
When did John Frederick William Herschel receive the Copley Medal?
SELECT ?f WHERE { resource:John_Frederick_William_Herschel property:award_received ?x . ?x property:award_received resource:Copley_Medal . ?x property:point_in_time ?f }
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/Q28003> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q14278 p:P166 ?s . ?s ps:P166 wd:Q28003 . ?s pq:P585 ?value}