On Monday, the International Earth Rotation and Reference Systems Service (IERS) revealed that 2015 will be a longer year. According to a statement released by IERS at the Paris Observatory, this year's June 30 will have an extra second. This is because earth is not rotating fast enough to keep up with time. The slower speed of the planet will add extra second in 2015.
As per Daniel Gambis, head of the Earth Orientation Center of the IERS, the extra second will be just after the 23:59:59 mark on June 30. On that day, the clock will have 23:59:60.