Re: Date for a week day of a month

["hubert depesz lubaczewski" <depesz@xxxxxxxxx>]

On 7/3/07, Emi Lu <emilu@xxxxxxxxxxxxxxxxx> wrote:

Can I know how to get the date of each month's last Thursday please?
Query:  select getDateBaseOnWeekday('2007-04-01', 'Last Thursday');
Result: 2007-04-26

you can easily do it without functions.
for example, this select:
SELECT
    cast(d.date + i * '1 day'::interval as date)
FROM
    (select '2007-04-01'::date as date) d,
    generate_series(0, 30) i
WHERE
    to_char(d.date
, 'MM') = to_char( cast(d.date + i * '1 day'::interval as date), 'MM')
    AND to_char(cast(d.date + i * '1 day'::interval as date), 'D') = '5'
ORDER BY 1 DESC
LIMIT 1
;
does what you need.
to get last-thursday for another month, just change: (select '2007-04-01'::date as date) d, to be 1st of any other month.

depesz