On Wed, Oct 11, 2017 at 10:35:12AM +0000, kes-kes@yandex.ru wrote:
>
> >Adjust interval so 30-day time periods are represented as months
>
> https://www.postgresql.org/docs/9.6/static/functions-datetime.html
>
Yes, it seems that it is because timestamp operations return '29 days':
=# SELECT timestamp '2016-01-31' +interval '1 month' -timestamp '2016-01-31';?column?
----------29 days
You can also try the following, maybe it is appropriate for you:
=# SELECT timestamp '2016-01-31' -timestamp '2016-01-31' +interval '1 month';?column?
----------1 mon
=# SELECT extract( month from justify_days( timestamp '2016-01-31'
-timestamp '2016-01-31' +interval '1 month') );date_part
----------- 1
--
Arthur Zakirov
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company
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