what is the {start time} for {Britney Spears} has {spouse} as {Jason Allen Alexander} ?
What was the date of Britney Spears' and Jason Allen Alexander's wedding?
When did Britney Spears and Jason Allen Alexander get married?
SELECT ?c WHERE { resource:Britney_Spears property:spouse ?b . ?b property:spouse resource:Jason_Allen_Alexander . ?b property:start_time ?c }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q11975> .
?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/Q27949402> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q11975 p:P26 ?s . ?s ps:P26 wd:Q27949402 . ?s pq:P580 ?value}