what is the {start time} for {South Africa} has {head of state} as {Jacob Zuma} ?
On what date did Jacob Zume become the head of state for South Africa?
When did Jacob Zume become the head of state for South Africa?
SELECT ?e WHERE { ?n property:head_of_state resource:Jacob_Zuma . ?n property:start_time ?e . resource:South_Africa property:head_of_state ?n }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q258> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P35> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q57282> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q258 p:P35 ?s . ?s ps:P35 wd:Q57282 . ?s pq:P580 ?value}