what is the {point in time} for {Supernatural} has {award received} as {Favorite Pop/Rock Album} ?
On what date did Supernatural win the Favorite Pop/Rock Album grant?
When did Supernatural win the Favorite Pop/Rock Album award?
SELECT ?e WHERE { ?y property:award_received resource:Favorite_Pop/Rock_Album . ?y property:point_in_time ?e . resource:Supernatural property:award_received ?y }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q819127> .
?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/Q19858080> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q819127 p:P166 ?s . ?s ps:P166 wd:Q19858080 . ?s pq:P585 ?value}