A bit tired?!

Uhmm, after discussing for several minutes what date it was, we concluded it was DEFINITELY Dec 10th. While in fact is was Dec 11th. Actually at that time of the day it was already Dec 12th, but we'll ignore that fact ;) So what date did we write down? Nov 10th!! We both checked the details and signed the paper... while it was completely NONSENSE! Guess we were both a bit tired... hope I get paid though...