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WITH j (dt) AS ( VALUES ('0303653597'),('0303701111'),('0510511111'),('0510051111') ) SELECT CASE WHEN substring(dt from 5 for 2)::int > '49' THEN to_date(substring(dt from 1 for 4) || '19' || substring(dt from 5 for 2), 'DDMMYYYY') ELSE to_date(substring(dt from 1 for 4) || '20' || substring(dt from 5 for 2), 'DDMMYYYY') END FROM j;
to_date
1965-03-03
1970-03-03
1951-10-05
2005-10-05