[color="#555555"][font="Arial, Helvetica, sans-serif"][size="2"]Come posso far si che il mio applicativo utilizzi di base un formato data del tipo "dd/MM/yyyy" ?[/size][/font][/color]
But the question still remain… why when i define language it_it the date format is dd/MMM/y, if i leave main.php without language definition the date format is yyyyy/MM/dd
As Zaccaria says, you can configure the way date format or any i18n related configuration on your main.php.
But, if you wish to find out the reason why you have that, you need to go to the YII Framework folder > i18n > it_it.php . There is a section there that you can easily override (sorry for pointing that out again)