Today, it is said to be first leap second since January 2009 and the 25th overall, ever since the practice was initiated. The next leap second will be added to the clocks on June 30, 2016.
This adjustment is required since the UTC time standard, which is widely used for international timekeeping and as the reference for civil time in most countries, uses the international system (SI) definition of the second, based on atomic clocks, adds Wikipedia.
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