In order to change the date format follow these steps:login to Web Calendar Pro as the administrator;choose "Calendars" from the main menu;press the "Manage Calendars" button;open the appropriate calendar from the list;then you will find "Date format" option below at the page;choose the option you need from the dropdown menu and press "Save" button.This setting will not affect already existing users. They can change date format this way:login to Web Calendar Pro as the user;click on the "Account" button on the right hand on the top;then you will find "Date format" option below at the page;choose the option you need from the dropdown menu and press "Submit" button.