Re: Leap Years

On 2010-02-25, Atif Jung <atifjung(at)gmail(dot)com> wrote:
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> INFORMIX uses the rleapyear(year) ESQLC function to determine if a year is a
> leap year or not. Does POSTGRES have an equivalent?

not yet.

CREATE FUNCTION rleapyear(integer) RETURNS BOOLEAN AS $$
select extract( day from ( $1 || '-02-28' ) :: date + '1 day'::interval) != 1
$$ LANGUAGE SQL;

it does now! years less than 1900 may give non-useful results locale
dependant, years less that 1600 will not work right.

I can't immagine when a function like that would be more useful than
just doing date arithmetic using intervals.