New Year's Resolutions

Why do we have New Year's Resolutions?   Why do we wait till New Year's to make changes in our lives?    Why can't we start today or yesterday?  Is it because we want 30 more days of eating greasy foods before we start our diet?    Or is it because we want to say "sh1t" one last time before we start throwing quarters in the potty mouth jar?

I'm just going to do it my way ... if I think of something I'll do it right then and there.   Then I'll probably forget about it the next day.