Have you checked your clock in settings? They might be set on manual, where you have to set it yourself.
In the same part of the settings I think there is a tick box for using the time from the network if you try that it might pick up the correct time.
I'm not exactly sure but the manual should walk you through how to set the time up.
Make sure your radio is working and tune it into a news station, usually cars pick up the time and date from the broadcast radio stations or the "rugby" time signal, if there's an issue with the aerial in your car it might not be able to get the right date and time.
See if there's anything in the r-link app that might help.
Also Somewhere in the menus in the car there might be a date setting section, here's what the manual says about the clock - resetting the clock
The time setting is done automatically. You may, however, change this.
From the display A, select “Menu”, then “System” then “Clock”.
Set the hours and minutes.
Select “End” to confirm your choice.