what is the {start time} for {Mexico City} has {twinned administrative body} as {Dolores Hidalgo Municipality} ?
When did Dolores Hidalgo Municipality become a twinned administrative body for Mexico City?
When did Mexico City have Dolores Hidalgo Municipality as a twinned administrative body?
SELECT ?b WHERE { resource:Mexico_City property:twinned_administrative_body ?a . ?a property:start_time ?b . ?a property:twinned_administrative_body resource:Dolores_Hidalgo_Municipality }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1489> .
?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/Q958153> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q1489 p:P190 ?s . ?s ps:P190 wd:Q958153 . ?s pq:P580 ?value}