Obviously, it's the beginning of a new year, the dawn of a new day, and if you are like many Americans, you've made resolutions that you intend to stick to.
It's also New Year's Dishonor List Day, although I can't find any information about this day. I imagine it means you dishonor the list of resolutions you've made or contemplated making.
If you're last name begins with a 'Z', you're in luck today. You get to go first in any line because it's Z Day. Urban Dictionary offers another interesting, albeit weird, definition for the day. If you believe in strange happenings or monsters, you might want to check it out.