I have a problem: in Italy, date format is dd mm yyyy and when a user input an event, the date picking shows a date format that generate confusion: 10 September 2013 become 9/10/2013 (that in Italy is 9 October 2013).
Another problem with date picking is that the weeks in the month shown when I pick a date, begin with Sunday, and here (like in lot of other places in the world) the first day of the week in Monday.