what is the {point in time} for {Delhi Metro} has {daily patronage} as {2.79e+06} ?
What was the date that Delhi Metro had a daily patronage of 279e+06.
When did the Delhi Metro have a daily patronage of 279e+06?
SELECT ?z WHERE { ?a property:point_in_time ?z . resource:Delhi_Metro property:daily_patronage ?a . FILTER ( ?x = 2.79e+06 ) . ?a property:daily_patronage ?x }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q271195> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1373> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <2.79e+06> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q271195 p:P1373 ?s . ?s ps:P1373 ?x filter(contains(?x , '2.79e+06')) . ?s pq:P585 ?value}