One of the first things I changed in the System Settings was the Current Format to Portuguese (Portugal).
However I still had to Set Personal Options Current Format to Portuguese (Portugal). You can do this at your CRM window menu under Tools > Set Personal Options. That may seem odd because if I have the server format configured to Portuguese (Portugal) my Personal Options should reflect that. A bug or a feature? I'm guessing this is a feature because it allows one to work with the format one preferes.