what is the {start time} for {Aleksey Konstantinovich Tolstoy} has {spouse} as {Sofia Andreevna Bachmeteva} ?
When were Aleksey Konstantinovich Tolstoy and Sofia andreevna bachmeteva married?
when did aleksey konstantinovich tolstoy marry sofia andreevna bachmeteva?
SELECT ?b WHERE { ?k property:start_time ?b . ?k property:spouse resource:Sofia_Andreevna_Bachmeteva . resource:Aleksey_Konstantinovich_Tolstoy property:spouse ?k }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q212575> .
?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/Q4079844> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q212575 p:P26 ?s . ?s ps:P26 wd:Q4079844 . ?s pq:P580 ?value}