What is {educated at} of {Herbert Hoover} that is {start time} is {1891-0-0} ?
What is the { begin time } of { Herbert Hoover } that's { 1891 - }?
What is the { start time } of { Herbert Hoover } that is { 1891.0 }?
SELECT ?c WHERE { ?a property:educated_at ?c . ?a property:start_time ?m . resource:Herbert_Hoover property:educated_at ?a . FILTER ( CONTAINS ( YEAR ( ?m ) , '1891' ) ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q35236> .
?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> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1891-0-0>
} 

SELECT ?obj WHERE { wd:Q35236 p:P69 ?s . ?s ps:P69 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1891')) }