In 2012, two servers run by the U.S. Navy rolled back their clocks 12 years, deciding it was the year 2000. The servers were very important: they’re part of a worldwide network that helps computers ...

A master time-of-day clock that computer and satellite networks are synchronized with worldwide. An atomic clock is known to be the most accurate measurement of time because it relies on a constant ...

Reader Dan loves his Asus netbook–but not its clock. Every time he turns the machine off, it seems to lose a couple hours. But the minutes, he notes, remain accurate. There are a number of reasons a ...