Setting a date for the return of Christ seems to be a plague of epic proportions. It is not new with this 2012 Mayan Myth, and I suppose there will always be yet another guy who has “figured it out”.
Please visit:

http://www.bible.ca/pre-date-setters.htm

Here you will find an incomplete, but massive list of those who have set the date for the second coming of Jesus Christ, only to have missed it again and again.