Originally Posted by
Upset123
On the 3rd of January I was leaving the EU from Greece and the border officer put in a completely wrong date both on my passport stamp and in the system. Instead of putting the exit date as 03/01/25, he put 13/02/25, causing me to barely have 15 days left, and on top of that making it look like I overstayed 12 days. I have flight tickets to prove I left the EU, and I can request entrance stamps from my country of residence (everything is electronic there now). I told the police I can get this proof for them, but they said the only thing that counts is what's in the EU system.
There's no EU wide system in place yet. Some individual member states have them in place but these only cover entries and exits from their territory. So, it's basically just the stamp.
I've seen a note (handwritten annotations on wet stamp plus a seal) done by German federal police next to a wrong French exit stamp. So that could be an option of course, one will need to proof the correct date of exit though. This could be done through boarding passes etc. for instance.
Italy once didn't stamp my wife's passport upon entry which subsequently led to questions by other countries when leaving Schengen, e.g. from Greece. Showing them the booking confirmation of the flight to Italy turned out to be sufficient every time she was asked about this.