what is the {start time} for {Fawlty Towers} has {producer} as {John Howard Davies} ?
When did Fawlty Towers, produced by John Howard Davies start?
What time does Fawlty Towers, whose producer is John Howard Davies start?
SELECT ?g WHERE { resource:Fawlty_Towers property:producer ?m . ?m property:start_time ?g . ?m property:producer resource:John_Howard_Davies }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q212731> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P162> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q772224> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q212731 p:P162 ?s . ?s ps:P162 wd:Q772224 . ?s pq:P580 ?value}