what is the {start time} for {European Union} has {official language} as {Irish} ?
When was Irish an official language of the European Union?
SELECT ?value WHERE { wd:Q458 p:P37 ?s . ?s ps:P37 wd:Q9142 . ?s pq:P580 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q458> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P37> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q9142> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

When was Irish an official language of the EU?