Traffic signs invalid because of formal errors?

Hello, the penultimate weekend in Hamburg: A concert, just in front of the venue parking spaces, apparently reserved for the NDR with signs: Absolute stop ban, from 29.11.2008 to 31.11.2008 I looked at it twice, but it was actually the 31.11.2008 on the sign. Was already trying to place me there, but I finally avoided the discussion. What does this look like now? Isn’t such a wrongly painted sign completely invalid? Soz Would you get away with it in court? Just as an objection to a roll with false §-statement always succeeds. Many greetings CoolHH