what is the {point in time} for {G.H. Hardy} has {award received} as {De Morgan Medal} ?
When G.H.Hardy received the De Morgan Medal?
When was the De Morgan Medal received by G.H.Hardy?
SELECT ?n WHERE { ?u property:point_in_time ?n . ?u property:award_received resource:De_Morgan_Medal . resource:G.H._Hardy property:award_received ?u }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q184337> .
?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/Q507299> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q184337 p:P166 ?s . ?s ps:P166 wd:Q507299 . ?s pq:P585 ?value}