W221 Time/Date COMAND won't sync

Cannot save current date in Comand.   I had to replace the battery possibly because of a parasitic drain.  Once replaced, I cannot get the dash analog clock synced with digital Comand clock.  Date reads 23/03/2003...when I change the date it will not save to the system.  I have tried resetting COMAND with the same result.  Any ideas?