what is the {end time} for {Rudolf Augstein} has {spouse} as {Gisela Stelly} ?
when did Rudolf Augstien and Gisela Stelly get divorced?
SELECT ?value WHERE { wd:Q62414 p:P26 ?s . ?s ps:P26 wd:Q20638958 . ?s pq:P582 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q62414> .
?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/Q20638958> .
?statement <http://www.wikidata.org/entity/P582> ?value. 
} 

On what date did Rudolf Augstien and Gisela Stelly get divorced?