Question: When did Lesotho start using a flag image as the Flag of Lesotho in 1966?
Paraphrase: When did Lesotho get a flag?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q1013 p:P41 ?s . ?s ps:P41 ?x filter(contains(?x , 'Flag of Lesotho (1966).svg')) . ?s pq:P580 ?value}