what is the {start time} for {Pervez Musharraf} has {position held} as {Chairman Joint Chiefs of Staff Committee} ?
Pervez Musharraf starts as Chairman of the Joint Chiefs of Staff Committee on?
when does Pervez Musharraf start as Chairman Joint Chiefs of Staff Committee?
SELECT ?n WHERE { ?z property:position_held resource:Chairman_Joint_Chiefs_of_Staff_Committee . resource:Pervez_Musharraf property:position_held ?z . ?z property:start_time ?n }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q40495> .
?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> <http://wikidata.dbpedia.org/resource/Q5068077> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q40495 p:P39 ?s . ?s ps:P39 wd:Q5068077 . ?s pq:P580 ?value}