System and method for wireless communication between an external unit and a motor vehicle

A system for wireless communication between a motor vehicle (1) and an external unit (2) comprising a terminal (4), characterized, in that - the motor vehicle (1) at a time data to the external unit (2) received, - the external unit (2) determines from the transmitted data at the time of a local local time of the motor vehicle (1), - the external unit (2) independently continuously calculates the local time of the motor vehicle (1) starting from the particular time of the local local time of the motor vehicle (1) and - the terminal (4) uses the calculated local time for setting or displaying times of motor vehicle functions.