what is the {start time} for {Ben Chifley} has {position held} as {Prime Minister of Australia} ?
At what time was Ben Chifley the Prime Minister of Australia?
When was Ben Chifley the Prime Minister of Australia?
SELECT ?i WHERE { ?s property:position_held resource:Prime_Minister_of_Australia . resource:Ben_Chifley property:position_held ?s . ?s property:start_time ?i }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q23379> .
?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/Q319145> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q23379 p:P39 ?s . ?s ps:P39 wd:Q319145 . ?s pq:P580 ?value}