Never be late again: Japan clocks keep time for 16 billion years

But it only works in extremely cold environment.

Japanese researchers have built a pair of clocks which they say are so accurate they will lose a second only every 16 billion years – longer than the Earth has been around.

This handout picture released from University of Tokyo on Feb 23, 2015, shows a pair of "cryogenic optical lattice clocks" which will lose a second only every 16 billion years. Photo: AFP