what is the {start time} for {Brett Favre} has {member of sports team} as {Green Bay Packers} ?
What was the date when Brett Favre started as a player on the Green Bay Packers?
When did Brett Favre become a member of the Green Bay Packers?
SELECT ?l WHERE { ?l property:member_of_sports_team resource:Green_Bay_Packers . resource:Brett_Favre property:member_of_sports_team ?l . ?l property:start_time ?l }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q267088> .
?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/Q213837> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q267088 p:P54 ?s . ?s ps:P54 wd:Q213837 . ?s pq:P580 ?value}