From: Greg Sabino Mullane <greg@turnstep.com>
To: pgsql-sql@postgresql.org
Cc: sgnerd@yahoo.com.sg
Subject: Re: Last day of month
Date: Thu, 26 Feb 2004 03:07:52 -0000
Message-ID: <542c7f6d5ebe4be44d6b3778850f38ff@biglumber.com> (raw)
In-Reply-To: <050b01c3fb9b$de4e1e30$7502a8c0@hdsc.com>
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> How to find the last sunday/mon..../sat of any given month.
There is probably a smoother way to do it, but here is a
quick little function to do what you ask. Feed it a date
and a number, where 0 is Sunday, 1 is Monday, etc.
CREATE OR REPLACE FUNCTION lastday(date,int) RETURNS DATE AS '
DECLARE
match date;
tomorrow date;
BEGIN
SELECT TO_DATE(
(SELECT EXTRACT(\'year\' FROM $1) || \' \' ||
EXTRACT(\'month\' FROM $1) || \' 01\'),
\'YYYY MM DD\') INTO tomorrow;
LOOP
tomorrow := tomorrow + \'24 hours\'::interval;
IF (1 = EXTRACT(\'day\' FROM tomorrow) ) THEN
RETURN match;
END IF;
IF ($2 = EXTRACT(\'dow\' FROM tomorrow)) THEN
match := tomorrow;
END IF;
END LOOP;
END;
' LANGUAGE plpgsql;
- --
Greg Sabino Mullane greg@turnstep.com
PGP Key: 0x14964AC8 200402252206
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To: pgsql-sql@postgresql.org
Cc: greg@turnstep.com, sgnerd@yahoo.com.sg
Subject: Re: Last day of month
In-Reply-To: <542c7f6d5ebe4be44d6b3778850f38ff@biglumber.com>
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