what is the {point in time} for {Sally Ride} has {educated at} as {Stanford University} ?
When in time was Sally Ride taught at Stanford University?
At what point in time was Sally Ride educated at Stanford University?
SELECT ?p WHERE { ?o property:educated_at resource:Stanford_University . ?o property:point_in_time ?p . resource:Sally_Ride property:educated_at ?o }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q49285> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P69> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q41506> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q49285 p:P69 ?s . ?s ps:P69 wd:Q41506 . ?s pq:P585 ?value}