Re: Is there a better way than this to get the start and end of a month? - Mailing list pgsql-sql

Well, month_end could be more straightforward as something like

select month_start ($1) + interval '1 day' - interval '1 month';

Dima

David Stanaway wrote:
> Here are the 2 functions I have at the moment. I was wondering if
> someone had a better way?
> 
> CREATE OR REPLACE FUNCTION month_start (date)
>   RETURNS date
>   AS '
>    DECLARE
>     day ALIAS FOR $1;
>    BEGIN
>     RETURN day - (extract(''day'' FROM day)||'' days'')::interval + 
>     ''1 day''::interval;          
>    END;
>   '
>   LANGUAGE 'plpgsql';
> 
> CREATE OR REPLACE FUNCTION month_end (date)
>   RETURNS date
>   AS '
>    DECLARE
>     day ALIAS FOR $1;
>     month int;
>     year int;
>    BEGIN
>     month := extract(''month'' FROM day);
>     year  := extract(''year'' FROM day);
>     IF month = 12 THEN
>      month := 1;
>      year  := year +1;
>     ELSE
>      month := month +1;
>     END IF;
>     RETURN (''01-''||month||''-''||year)::date - 
>     ''1 day''::interval;
>     END;
>    '
>    LANGUAGE 'plpgsql';
> 
>