What is {chairperson} of {United States Department of State} that is {end time} is {2013-2-1} ?
Who chaired the US Department of State in January of 2013?
Who was the chairperson of the US Department of State in January of 2013?
SELECT ?v WHERE { ?t property:chairperson ?v . ?t property:end_time ?p . FILTER ( CONTAINS ( YEAR ( ?p ) , '2013' ) ) . resource:United_States_Department_of_State property:chairperson ?t }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q789915> .
?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/P582> <2013-2-1>
} 

SELECT ?obj WHERE { wd:Q789915 p:P488 ?s . ?s ps:P488 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'2013')) }