What is {chairperson} of {University of Tokyo} that is {start time} is {2015-4-1} ?
On March 1st, 2015, who was the chairperson of the University of Tokio?
Who was the chairperson of the University of Tokio on March 1st, 2015?
SELECT ?z WHERE { FILTER ( CONTAINS ( YEAR ( ?q ) , '2015' ) ) . resource:University_of_Tokyo property:chairperson ?k . ?k property:start_time ?q . ?k property:chairperson ?z }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q7842> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P488> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <2015-4-1>
} 

SELECT ?obj WHERE { wd:Q7842 p:P488 ?s . ?s ps:P488 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'2015')) }