There-and-gone “leap second” causes major issues for numerous sites
cause On Saturday night, a single second was added to the atomic clocks of the world in a somewhat rare event called a leap second, which ensures that atomic time remains aligned with solar time. Most people didn’t even notice.
reaction However, with the rise of cloud computing, every second counts, and the leap second actually caused huge problems for Reddit, Gawker, Mozilla, LinkedIn and numerous other sites. Who knew a second was so essential? source