What is {head of government} of {University of North Carolina at Chapel Hill} that is {start time} is {2013-7-1} ?
Who is the head of government of University of North Carolina at Chapel Hill since 2013-7-1?
SELECT ?obj WHERE { wd:Q192334 p:P6 ?s . ?s ps:P6 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'2013')) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q192334> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P6> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <2013-7-1>
} 

Who was the president of UNC Chapel Hill beginning 2013-7-1?