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SELECT (date_trunc('month', dt) + INTERVAL '1 MONTH - 1 day' ):: DATE AS frequency FROM generate_series( DATE '2018-01-31', DATE '2018-05-31', interval '1 MONTH' ) AS dt
frequency
2018-01-31
2018-02-28
2018-03-31
2018-04-30
2018-05-31
SELECT 5