What is {spouse} of {Joan Rivers} that is {start time} is {1955-1-1} ?
On New Year's Day 1955, who did Joan Rivers marry?
Who did Joan Rivers marry on January 1, 1955?
SELECT ?g WHERE { ?p property:spouse ?g . ?p property:start_time ?k . resource:Joan_Rivers property:spouse ?p . FILTER ( CONTAINS ( YEAR ( ?k ) , '1955' ) ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q240933> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P26> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1955-1-1>
} 

SELECT ?obj WHERE { wd:Q240933 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1955')) }