What is {country} of {Dhaka} that is {start time} is {1971-3-26} ?
Which country in Dhaka formed in 1971?
What country in Dhaka formed on 3-26-1971?
SELECT ?b WHERE { ?i property:start_time ?k . ?i property:country ?b . resource:Dhaka property:country ?i . FILTER ( CONTAINS ( YEAR ( ?k ) , '1971' ) ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1354> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P17> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1971-3-26>
} 

SELECT ?obj WHERE { wd:Q1354 p:P17 ?s . ?s ps:P17 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1971')) }