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Computers and the networks they create are all very logical, and dependent on a number of unchanging standards to function. However, the universe sets its own rules and operates on a logic all its own. This year, we will have exactly one extra second of time with 31,536,001 seconds instead of the usual 31,536,000--and this presents a big problem for computers.
To compensate, the Paris Observatory has announced that it will be add an extra second to clocks on June 30. This extra second, popularly known as a leap second, isn't that big a deal to us humans but for computers this presents a huge challenge. Imagine, if you will, if every computer in the world was suddenly off by one second.
This problem is going to cause so many ramifications for computer systems worldwide that many software companies are already preparing for the issues.
How did this happen? While Atomic time is constant, the rotation of the Earth is actually slowing by 2000ths of a second every day. This slowdown means there will be an extra second in 2015. The extra second is added to the universal coordinated time (UTC) so that it matches the atomic time created a problem much like the Y2K bug that affected computers at the turn of the century.
On June 30, 2015, the clock will read 11:59:60 and this will cause issues with many computer systems which are not programmed to handle the time. As many systems are dependent on precise time, issues are expected as many systems simply aren't capable of handling that one extra second.