what is the {start time} for {Ted Kaczynski} has {educated at} as {Harvard University} ?
During what time was Ted Kaczynski educated at Harvard University?
When was Ted Kaczynski educated at Harvard University?
SELECT ?f WHERE { ?y property:start_time ?f . resource:Ted_Kaczynski property:educated_at ?y . ?y property:educated_at resource:Harvard_University }
select distinct ?value  where {
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?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/Q13371> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q222134 p:P69 ?s . ?s ps:P69 wd:Q13371 . ?s pq:P580 ?value}