Open Blockland, open the console and type trace(1); then get a user to join, ban them, then get them to rejoin. Then close Blockland and paste the contents of console.log (in your blockland folder)
It looks like it can't determine the year consistently on your system. What operating system are you running? If you do echo(getDateTime()); in the console, what is displayed? Are you doing anything weird that might effect the system clock?
(Besides maybe doing explodeclock(); every once in awhile)
That would have nothing to do with it