On June 30 timekeepers all over the world will be adjusted – by one “leap” second.

Tuesday will be a fraction longer than other days as scientists will add an extra second, called a “leap” second, to the atomic clocks to synchronize the Earth’s rotation, which according to the Paris-based International Earth Rotation Service (IERS) was slowing down by around 2,000th of a second each day.

Physicist Rob Douglas said that if the time is not adjusted it could lead to the dysfunction of equipment that are reliant on clock-like satellites.

“The modeling of the Earth predicts that more and more leap seconds will be called for in the long-term, but we can not say that one will be needed every year, “ Douglas said.

According to Daniel MacMillan of NASA’s Goddard Space Flight Center in Greenbelt, Maryland, day length is influenced by everything from tectonic activity to groundwater to El Nino events.

These events cause minor changes in time when they happen; but, repeated every day for a year and those milliseconds add up to nearly a second.

In 2012, this time adjustment made headlines when it caused a few glitches on the Internet. Companies such ass Reddit, LinkedIn, Gimodo and FourSquare experienced glitches as their network clocks failed to read the extra second.

Some of the world’s most prominent official timekeepers have suggested abandoning the idea of the “leap second” entirely because of the potential loss of millions in the worldwide stock market caused by the delay, but it looks set to stay in place until 2020 at least.