Ewald Geschwinde <webmaster@geschwinde.net> writes:
> beta=# SELECT ('2001-10-28'::date + '1 day'::interval)::date;
> ?column?
> ------------
> 2001-10-28
> (1 row)
Try using date arithmetic, rather than timestamp arithmetic:
regression=# SELECT '2001-10-28'::date + 1;
?column?
------------
2001-10-29
(1 row)
The problem with the other is that type interval considers '1 day'
to mean '24 hours', which is not what you want. Since 10/28 is
a DST transition day (at least here in the USA), there's a difference.
What you're really getting is a timestamp addition:
regression=# SELECT ('2001-10-28'::date + '1 day'::interval);
?column?
------------------------
2001-10-28 23:00:00-05
(1 row)
which doesn't produce the desired result when you coerce the timestamp
back to date.
However, adding a plain integer to a date will do what you want.
regards, tom lane
