what is the {start time} for {Bruce Lee} has {educated at} as {University of Washington} ?
When did Bruce Lee attend the University of Washington?
When was Bruce Lee educated at the University of Washington?
SELECT ?o WHERE { ?m property:educated_at resource:University_of_Washington . ?m property:start_time ?o . resource:Bruce_Lee property:educated_at ?m }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q16397> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P69> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q219563> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q16397 p:P69 ?s . ?s ps:P69 wd:Q219563 . ?s pq:P580 ?value}