what is the {start time} for {Carl Barks} has {employer} as {The Walt Disney Studios} ?
During which time period was Carl Banks employed with the Walt Disney Company?
When was Carl Banks employed by the Walt Disney Company?
SELECT ?t WHERE { ?i property:employer resource:Walt_Disney_Studios . ?i property:start_time ?t . resource:Carl_Barks property:employer ?i }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q11941> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P108> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q2216535> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q11941 p:P108 ?s . ?s ps:P108 wd:Q2216535 . ?s pq:P580 ?value}