100 seconds to midnight
Every January, the scientists assess how close the world is to ending, in their view, and use knowledge of how things have changed to move the clock either closer or farther away from midnight. To quote Prince's prescient 1999 lyrics, the idea is that when the clock strikes 12, it's party over, oops, out of time... More here.
At least it stayed the same this year which for me was a bit of a surprise.