what is the {start time} for {Georg Simon Ohm} has {member of} as {Royal Society} ?
What is the date that Georg Simon Ohm began his membership in the Royal Society?
When did Georg Simon Ohm become a member of the Royal Society?
SELECT ?i WHERE { resource:Georg_Simon_Ohm property:member_of ?k . ?k property:member_of resource:Royal_Society . ?k property:start_time ?i }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1585> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P463> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q123885> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q1585 p:P463 ?s . ?s ps:P463 wd:Q123885 . ?s pq:P580 ?value}