what is the {start time} for {Moscow} has {twinned administrative body} as {Banja Luka} ?
On what date was Banja Luka a twinned administrative body with Moscow?
when was Moscow has twinned administrative body as Banja Luka ?
SELECT ?m WHERE { ?a property:twinned_administrative_body resource:Banja_Luka . ?a property:start_time ?m . resource:Moscow property:twinned_administrative_body ?a }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q649> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P190> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q131127> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q649 p:P190 ?s . ?s ps:P190 wd:Q131127 . ?s pq:P580 ?value}