what is the {point in time} for {Daniel J. Boorstin} has {award received} as {Bancroft Prize} ?
Given the year Daniel J. Boorstin was awarded a Brancroft prize.
In which year did Daniel J. Boorstin receive a Bancroft prize?
SELECT ?k WHERE { ?l property:point_in_time ?k . ?l property:award_received resource:Bancroft_Prize . resource:Daniel_J._Boorstin property:award_received ?l }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q551252> .
?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/Q724144> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q551252 p:P166 ?s . ?s ps:P166 wd:Q724144 . ?s pq:P585 ?value}