Re: current_date / datetime stuff

Kristo Kaiv escreveu:
> oneliner:
>
> select date_trunc('month',now()) + ((8 - extract('dow' from
> date_trunc('month',now()))||'days')::text)::interval;
>

There is a problem when first monday is 1st or 2nd day of month.

bdteste=# SELECT date_trunc('month',meses) + ((8 - extract('dow' from
date_trunc ('month',meses))||'days')::text)::interval FROM (SELECT
('2007-' || s.a || '-15')::timestamp as meses FROM generate_series(1,12)
as s(a)) AS foo;
?column?
---------------------
2007-01-08 00:00:00
2007-02-05 00:00:00
2007-03-05 00:00:00
2007-04-09 00:00:00
2007-05-07 00:00:00
2007-06-04 00:00:00
2007-07-09 00:00:00
2007-08-06 00:00:00
2007-09-03 00:00:00
2007-10-08 00:00:00
2007-11-05 00:00:00
2007-12-03 00:00:00
(12 registros)

Testing this condition we have the correct answer:
bdteste=# SELECT date_trunc('month',foo) + ((CASE WHEN extract('dow'
from date_trunc('month',foo)) > 1 THEN 8 ELSE 1 END) - extract('dow'
from date_trunc ('month',foo)))*'1 day'::interval FROM (SELECT ('2007-'
|| s.a || '-15')::timestamp as foo FROM generate_series(1,12) as s(a))
AS bar;
?column?
---------------------
2007-01-01 00:00:00
2007-02-05 00:00:00
2007-03-05 00:00:00
2007-04-02 00:00:00
2007-05-07 00:00:00
2007-06-04 00:00:00
2007-07-02 00:00:00
2007-08-06 00:00:00
2007-09-03 00:00:00
2007-10-01 00:00:00
2007-11-05 00:00:00
2007-12-03 00:00:00
(12 registros)

[]s
Osvaldo