How to get the number of days in a month?

Question

I am trying to get the following in Postgres:

select day_in_month(2);

Expected output:

28

Is there any bu

Answer 1

This works as well.

WITH date_ AS (SELECT your_date AS d)
SELECT d + INTERVAL '1 month' - d FROM date_;

Or just:

SELECT your_date + INTERVAL '1 month' - your_date;

These two return interval, not integer.