Problem with data format

Hi, i use Postgresql 7.2 on a windows server (Win 2000 Server).
The problem is that when i write a date into a timestamp field of a table,
it writes it in to No-Europe format.

So, for istance, if i write the date: 04/03/2004 (4 Mar 2004), it writes the
date 03/04/2004 (3 Apr 2004) into the table .

Why?
Is there a way to avoid this?

Tanck you for help!
Dario