what is the {start time} for {Andrei Mironov} has {spouse} as {Yekaterina Gradova} ?
When did Andrei Mironov and Yekaterina Gradova get hitched?
When did Andrei Mironov and Yekaterina Gradova get married?
SELECT ?p WHERE { ?e property:start_time ?p . ?e property:spouse resource:Yekaterina_Gradova . resource:Andrei_Mironov property:spouse ?e }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q469550> .
?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> <http://wikidata.dbpedia.org/resource/Q4147409> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q469550 p:P26 ?s . ?s ps:P26 wd:Q4147409 . ?s pq:P580 ?value}