2009/11/29 David E. Wheeler <david@kineticode.com>:
> On Nov 28, 2009, at 5:40 PM, Bruce Momjian wrote:
>
>> I think there is general agreement that we should have a timezone data
>> type which validates against pg_timezone_names().name. It might be
>> enough to just document how users can create such a domain data type,
>> but I don't know of a way to do that. Is this a TODO?
>
> From http://justatheory.com/computers/databases/postgresql/citext-patch-submitted.html
>
> CREATE OR REPLACE FUNCTION is_timezone( tz TEXT ) RETURNS BOOLEAN as $$
> BEGIN
> PERFORM now() AT TIME ZONE tz;
> RETURN TRUE;
> EXCEPTION WHEN invalid_parameter_value THEN
> RETURN FALSE;
> END;
> $$ language plpgsql STABLE;
>
> CREATE DOMAIN timezone AS CITEXT
> CHECK ( is_timezone( value ) );
>
> It could also be TEXT I suppose, but "America/Los_Angeles" and "america/los_angeles" should be considered the same.
nice :)
Pavel
>
> Best,
>
> David
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