What is {population} of {Clermont-Ferrand} that is {point in time} is {2013-1-1} ?
How many people lived in Clermont-Ferrand on January 1st, 2013?
What was the population of Clermont-Ferrand on 1-1-2013?
SELECT ?q WHERE { resource:Clermont-Ferrand property:population ?f . FILTER ( CONTAINS ( YEAR ( ?x ) , '2013' ) ) . ?f property:point_in_time ?x . ?f property:population ?q }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q42168> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1082> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P585> <2013-1-1>
} 

SELECT ?obj WHERE { wd:Q42168 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2013')) }