what is the {start time} for {Chiang Mai} has {twinned administrative body} as {Saitama Prefecture} ?
When did Chiang Mai gotten to be the sister city of Saitama Prefecture?
When did Chiang Mai become the sister city of Saitama Prefecture?
SELECT ?w WHERE { resource:Chiang_Mai property:twinned_administrative_body ?p . ?p property:twinned_administrative_body resource:Saitama_Prefecture . ?p property:start_time ?w }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q52028> .
?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/Q128186> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q52028 p:P190 ?s . ?s ps:P190 wd:Q128186 . ?s pq:P580 ?value}