what is the {start time} for {Gunnar Myrdal} has {spouse} as {Alva Myrdal} ?
In which year did Alva Mydral marry Gunnar Myrdal?
When was Alva Myrdal married to Gunnar Myrdal?
SELECT ?k WHERE { resource:Gunnar_Myrdal property:spouse ?e . ?e property:start_time ?k . ?e property:spouse resource:Alva_Myrdal }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q152452> .
?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/Q152437> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q152452 p:P26 ?s . ?s ps:P26 wd:Q152437 . ?s pq:P580 ?value}