what is the {start time} for {Black Mirror} has {production company} as {Zeppotron} ?
In what year was Black Mirror produced by Zeppotron?
When did Zeppotron produce Black Mirror?
SELECT ?m WHERE { ?e property:production_company resource:Zeppotron . resource:Black_Mirror property:production_company ?e . ?e property:start_time ?m }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q558112> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P272> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q8069350> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q558112 p:P272 ?s . ?s ps:P272 wd:Q8069350 . ?s pq:P580 ?value}