Paris Observatory announced that 2015 turns out to be a slightly longer because there’s an added second to most clocks in summer.

The Earth's rotation is slightly slowing down by around two thousandths of a second per day while atomic time is constant.

It was in 1972 when the first leap was added, thus marks the 26th time that it has been added to the clock and will be part of the history.

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On the final day of June as the bulletin advises authorities to take-charge in introducing Coordinated Universal Time (UTC). Instead of reading it as 11:59:59 p.m. on June 30, it will be read as 11:59:60 p.m.

Nick Stamatakos, the chief of Earth Orientation Parameters at the US Naval Observatory, said that instead of the normal 86, 400 seconds, there will be 86, 401. Everyone on earth will have an extra second to consider on the last day of June.

Every year, there’s at least one second that is added from 1972-1979, and throughout the 1980s, the leap seconds were added six time. It lowers down since 1999 as there were only four leap seconds added.

The downside of having leap seconds is that it becomes too disruptive when used for navigation and even communication, making it one of the core reasons why U.S. would like to get rid of the idea of leap seconds.

In a conference at Geneva in 2012, most delegates argued on the effect of the leap second but Britain opposes, as getting rid of leap second might result into breaking the link on the concept of time and of the rising and setting of Sun.

It can also have a negative effect for the Greenwich Mean Time that was adopted by Britain in 1987 that focuses on the time that the Sun crosses the Greenwich Meridian.

This year can be the last leap second that can be recorded in history.

Tagsleap second, TIME, concept of time, leap second on June 30, leap seconds, Paris Observatory