Have you updated the copyright/ownership/last updated/last renewed note at the bottom of your website and/or blog to "2013" yet?
While you're at it, take ten minutes to check your contact details, and update them if necessary.
Don't feel like you have to get lost in a whole-site review right this minute. Believe me, I know the temptation--I'll be overhauling my own site soon--but for now, just a little January brush-up will do.
Just speaking as a consumer who has a moment of hesitation when she notices the date at the bottom of a shopping cart is a year or more behind...I admit, that's perhaps a bit irrational, but it's also an easy fix.