what is the {start time} for {George Abbott} has {spouse} as {Mary Sinclair} ?
When did George Abbott and Mary Sinclair get married?
SELECT ?value WHERE { wd:Q1506831 p:P26 ?s . ?s ps:P26 wd:Q4309887 . ?s pq:P580 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1506831> .
?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/Q4309887> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

On what date did George Abbott and Mary Sinclair marry?