Question: did vladimir putin perticipate in 1999-12-31?
Paraphrase: In 1999-12-31, did Vladimir Putin perticipate?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q7747 p:P1344 ?s . ?s ps:P1344 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1999')) }