clock not working - does not go forward
 

Hello everyone,

Just bought my 7th Volvo and my 5th 850/x70 one and found something i never encounter.
It's a 2000 V70 TDI manual.
The clock stayed were it is, i mean when i bought the car it showed 0:00 and never went forward.
I tried to set it up one day at 17:38 and it stays like that until i disconnect the battery again for another operation.
Since then i did not set it up again but it does not go forward.

So far i tried to disconnect the battery overnight (for 2 days to be sure) nothing new... really not important but i don't like to have that in front of me, not working...
The car starts very well even by some cold days... battery seems to be good.
Any advices are welcome.
Still can't plug the Vida on it but can it be done?
Thanks