It’s Leap-Second Day. Do You Know Where Your Computer Is?

“About 50 years ago, we started keeping time with atomic clocks—clocks that operate according to the oscillations of a tiny atom.—and in order to keep these clocks in step with the earth, we add an extra second every now and again. The trouble is: the world’s computers, often running on ancient software code, aren’t always configured to accommodate this extra second. And that can cause problems.”