what is the {start time} for {Roberto Carlos} has {member of sports team} as {Brazil national football team} ?
What date did Roberto Carlos get his start with the Brazil national football team?
When did Roberto Carlos start at the Brazil national football team?
SELECT ?k WHERE { ?w property:start_time ?k . resource:Roberto_Carlos property:member_of_sports_team ?w . ?w property:member_of_sports_team resource:Brazil_national_football_team }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q429039> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P54> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q83459> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q429039 p:P54 ?s . ?s ps:P54 wd:Q83459 . ?s pq:P580 ?value}