what is the {point in time} for {Mérida} has {twinned administrative body} as {Incheon} ?
On what date was Mérida twinned with Incheon?
When was Mérida twinned with Incheon?
SELECT ?y WHERE { ?m property:point_in_time ?y . ?m property:twinned_administrative_body resource:Incheon . resource:Mérida property:twinned_administrative_body ?m }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q165204> .
?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/Q20934> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q165204 p:P190 ?s . ?s ps:P190 wd:Q20934 . ?s pq:P585 ?value}