Re: Date for a week day of a month

[Emi Lu <emilu@xxxxxxxxxxxxxxxxx>]

generate_series that's a good one!

Thank you!


> 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