The UTC time on tachographs can and are sometimes out but legally they’re not allowed to be more than ±20 minutes from the true time, from memory any more than 20 minutes out and the only journey the vehicle can legally make is to a tachograph centre to have the time corrected.
You can only correct the UTC time by a minute a week so if it’s 22 minutes out it needs a visit to a tachograph centre.