This year to be one second longer: US Naval Observatory

In 1970, international agreements established a procedure to maintain a relationship between Coordinated Universal Time (UTC) and UT1, a measure of the Earth’s rotation angle in space.
On December 31 this year, a “leap second” will be added to the world’s clocks at 23 hours, 59 minutes 59 seconds Coordinated Universal Time, the US Naval Observatory has announced. This corresponds to 4:29:59 am IST, on January 1, 2017 when the extra second will be inserted at the US Naval