what is the {start time} for {Suriname} has {member of} as {United Nations} ?
On what date did Suriname become a member of the UN?
When did Suriname become a member of the UN?
SELECT ?e WHERE { resource:Suriname property:member_of ?c . ?c property:start_time ?e . ?c property:member_of resource:United_Nations }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q730> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P463> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1065> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q730 p:P463 ?s . ?s ps:P463 wd:Q1065 . ?s pq:P580 ?value}