what is the {start time} for {Katharine Graham} has {award received} as {Library of Congress Living Legend} ?
On what date did Katharine Graham win the Living Legend award for the Library of Congress?
When did Katharine Graham receive the Library of Congress Living Legend award?
SELECT ?v WHERE { ?b property:start_time ?v . resource:Katharine_Graham property:award_received ?b . ?b property:award_received resource:Library_of_Congress_Living_Legend }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q435203> .
?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/Q6542686> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q435203 p:P166 ?s . ?s ps:P166 wd:Q6542686 . ?s pq:P580 ?value}