Hi Clement. In terms of the date format for the main web user interface, it is deterined by your browser language. You need to have either English (UK) or English (Australian) as the language at the top of the list of languages in your Chrome browser settings (assuming you're using Chrome). I recommend using English (UK) because this causes your timesheet weeks to start with a Monday, allowing 1 week to fit on one page. As far as I know the browser language also controls the date format for exports as I've never had any issues with that. Regards, David Cornwell