“Airlines, trading floors and technology companies are braced for chaos today as world timekeepers prepare to add a leap second to global clocks.
“Immediately before midnight dials will read 11:59:60 as clocks hold their breath for a second to allow the Earth’s rotation to catch up with atomic time.
“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.”
Read more at Telegraph.co.uk