In the system setting you can select Dutch format. In 'Customizing regional options' you can change the 'First day of the week' to monday (in almost al countries first the of the week is monday). In the calander control of the Time Entries the week starts on monday. Example 2-july-2018 till 8-july-2017.

But when using the functies Copy or Import (Resource Assigments, Resource Bookings, Exchange Appointments) the Start and End Date are automatically filled. But the dates are still filled from sunday (1-july) till saterday (7-july) instead of monday (2-july) till sunday (8-july). This is not correct.