what is the {point in time} for {L'Hospitalet de Llobregat} has {population} as {250536.0} ?
When did L'Hospitalet de Llobregat reach a population of 250,536?
At what time did L'Hospitalet de Llobregat have a population of 250,536?
SELECT ?q WHERE { ?u property:point_in_time ?q . ?u property:population ?j . FILTER ( CONTAINS ( ?j , '250536.0' ) ) . resource:L'Hospitalet_de_Llobregat property:population ?u }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q15470> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1082> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <250536.0> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q15470 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '250536.0')) . ?s pq:P585 ?value}