possibly a bug?

beta=# select version();
                            version
---------------------------------------------------------------
 PostgreSQL 7.1.3 on i686-pc-linux-gnu, compiled by GCC 2.95.3
(1 row)

Is this a bug or Am i Wrong?
Or can be done this with another sql statement
I want to know only the next day of a date


beta=# SELECT ('2001-10-26'::date + '1 day'::interval)::date;
  ?column?
------------
 2001-10-27
(1 row)

beta=# SELECT ('2001-10-27'::date + '1 day'::interval)::date;
  ?column?
------------
 2001-10-28
(1 row)

beta=# SELECT ('2001-10-28'::date + '1 day'::interval)::date;
  ?column?
------------
 2001-10-28
(1 row)

Ewald Geschwinde