What is {educated at} of {Karl Marx} that is {start time} is {1830-0-0} ?
Where did Karl Marx star his education in 1830?
Where did Karl Marx begin his education in the year 1830?
SELECT ?n WHERE { resource:Karl_Marx property:educated_at ?z . FILTER ( CONTAINS ( YEAR ( ?e ) , '1830' ) ) . ?z property:start_time ?e . ?z property:educated_at ?n }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q9061> .
?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> <1830-0-0>
} 

SELECT ?obj WHERE { wd:Q9061 p:P69 ?s . ?s ps:P69 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1830')) }