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AnonTechie writes:

Physicists have said they have fine-tuned an atomic clock to the point where it won’t lose or gain a second in 15bn years – longer than the universe has existed.

The “optical lattice” clock ( http://www.nature.com/ncomms/2015/150421/ncomms7896/full/ncomms7896.html ), which uses strontium atoms, is now three times more accurate than a year ago when it set the previous world record, its developers reported in the journal Nature Communications.

The advance brings science a step closer to replacing the current gold standard in timekeeping: the caesium fountain clock that is used to set Coordinated Universal Time (UTC), the official world time.

http://www.theguardian.com/science/2015/apr/22/record-breaking-clock-invented-which-only-loses-a-second-in-15-billion-years

[Also Covered By]: http://www.theverge.com/2015/4/22/8466681/most-accurate-atomic-clock-optical-lattice-strontium