what is the {start time} for {Humphrey Bogart} has {spouse} as {Mayo Methot} ?
When did Humphrey Bogart and Mayo Methot marry?
When did Humphrey Bogart and Mayo Methot get married?
SELECT ?y WHERE { ?b property:start_time ?y . ?b property:spouse resource:Mayo_Methot . resource:Humphrey_Bogart property:spouse ?b }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q16390> .
?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/Q529654> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q16390 p:P26 ?s . ?s ps:P26 wd:Q529654 . ?s pq:P580 ?value}