When the last leap second was added in 2012 Mozilla, Reddit, Foursquare, Yelp, LinkedIn, and StumbleUpon all reported crashes and there were problems with the Linux operating system and programmes written in Java. In Australia, more than 400 flights were grounded as the Qantas check-in system crashed. Experts at Britain’s National Physical Laboratory (NPL) who will officially add the second to UK time, warned that markets which are already jittery from Greece could suffer transaction delays if their software was not prepared. “There are consequences of tinkering with time,” said Peter Whibberley, Senior Research Scientist in the Time and Frequency...