what is the {valid in period} for {Los Angeles} has {located in time zone} as {UTC−07:00} ?
What is the time in LA when its UTC-07:00?
What is the valid in period for Los Angeles with its time zone UTC−07:00?
SELECT ?t WHERE { resource:Los_Angeles property:located_in_time_zone ?t . ?t property:valid_in_period ?t . ?t property:located_in_time_zone resource:UTC−07:00 }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q65> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P421> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q2212> .
?statement <http://www.wikidata.org/entity/P1264> ?value. 
} 

SELECT ?value WHERE { wd:Q65 p:P421 ?s . ?s ps:P421 wd:Q2212 . ?s pq:P1264 ?value}