What is {partner} of {Colin Firth} that is {start time} is {1989-1-1} ?
Who was Colin Firth's partner on 1989-1-1?
who was Colin Firth's partner as at 1989-1-1?
SELECT ?u WHERE { ?i property:start_time ?w . FILTER ( CONTAINS ( YEAR ( ?w ) , '1989' ) ) . ?i property:unmarried_partner ?u . resource:Colin_Firth property:unmarried_partner ?i }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q162492> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P451> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1989-1-1>
} 

SELECT ?obj WHERE { wd:Q162492 p:P451 ?s . ?s ps:P451 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1989')) }