What is {position held} of {John McEwen} that is {start time} is {1967-12-19} ?
What position did John McEwen hold on the 19th December 1967?
SELECT ?obj WHERE { wd:Q23386 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1967')) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q23386> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P39> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1967-12-19>
} 

On 19th December 1967 John McEwen holds which position ?