Every year, millions of people stay up until midnight on the night of December 31 to ring in the new year. I have never understood this. I find this quite arbitrary. Prior to midnight, we write "2018" on our checks, and after midnight, we write "2019." If we are celebrating the changing of one element on our calendars, then why are we not doing this every month or every day? One could argue that we celebrate because we only change the year once every 365 days, but if we are simply celebrating the novelty of the changing of the date, it would make more sense to celebrate a new decade.