what is the {point in time} for {xkcd} has {award received} as {Hugo Award for Best Graphic Story} ?
Xkcd won the Hugo Award for Best Graphic Story in what year?
When did xkcd win the Hugo Award for Best Graphic Story?
SELECT ?k WHERE { resource:xkcd property:award_received ?q . ?q property:award_received resource:Hugo_Award_for_Best_Graphic_Story . ?q property:point_in_time ?k }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q13915> .
?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/Q10960478> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q13915 p:P166 ?s . ?s ps:P166 wd:Q10960478 . ?s pq:P585 ?value}