Ahh, you are talking about the Doomsday Clock, Anagha 😊 — not the regular midnight clock. Here’s a clear article about it:

The Doomsday Clock

The Doomsday Clock is a symbolic clock that represents how close humanity is to global disaster. It was created in 1947 by scientists from the Bulletin of the Atomic Scientists. The clock does not measure real time. Instead, it shows how near the world is to serious dangers such as nuclear war, climate change, and other global threats.

In the Doomsday Clock, midnight represents a global catastrophe that could seriously harm life on Earth. The time shown on the clock changes depending on world situations. When global tensions and dangers increase, the clock moves closer to midnight. When the world becomes safer, the clock moves further away from midnight.

Scientists and experts study many factors before changing the time. These include nuclear weapons, environmental damage, technological risks, and international conflicts. Their goal is to warn people and leaders about the importance of protecting the planet and maintaining peace.