what is the {start time} for {John Galliano} has {employer} as {Maison Martin Margiela} ?
When did John Galliano begin at Maison Martin Margiela?
When did John Galliano start working at Maison Martin Margiela?
SELECT ?q WHERE { ?m property:employer resource:Maison_Martin_Margiela . resource:John_Galliano property:employer ?m . ?m property:start_time ?q }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q313607> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P108> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1726925> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q313607 p:P108 ?s . ?s ps:P108 wd:Q1726925 . ?s pq:P580 ?value}