You can write your message now and have it sent precisely at midnight
Facebook is preparing for the New Year message deluge by making it possible to schedule a message in advance.This way, you can think about what you're going to write in advance and have it ready to go by the end of the year. Your message will be delivered at midnight on December 31.
You'll be free to enjoy your evening without fiddling with phones, tablets or laptops, though, chances are, you'll still be doing that.
The feature is part of the Facebook Stories app, so you'll have to authorize that first. But it's an official app, so there should be no issues with it.
In the app, you'll be able to craft a message and send it to as many friends as you like. The default message is "Have a Happy New Year and a great 2013!" but you'll probably going to want to change that.