Nasty .. just nasty. If you happen to own a PS3 older than one of the slim versions Sony is actually recommending that you don't use it until they have fixed a date issue
As you may be aware, some customers have been unable to connect to the PlayStation Network today. This problem affects the models other than the new slim PS3. We believe we have identified that this problem is being caused by a bug in the clock functionality incorporated in the system.
Errors include: