After three decades of debate, the leap second is now officially history. The BIPM has announced that it will stop issuing leap seconds in May 2027, as the average person blissfully unaware, this decision has significant implications for technology.

The leap second was introduced in 1972 to bridge the gap between atomic time and the Earth's rotation. While it helped keep our digital world in sync, it also caused problems for systems that rely on UTC. Google and Meta, for example, use a 'smear' method to deal with leap seconds, spreading the adjustment over a day to avoid disruption. Yet, leap seconds also posed risks, with Qantas experiencing booking system failures in 2012.

The decision to abolish leap seconds is partly due to the risk of a negative leap second. Climate change and melting ice have caused the Earth to rotate faster, making the risk of a negative leap second more likely. The BIPM cites concerns over the unpredictability and potential failures of such a leap, which could have severe consequences.

While the leap second's demise is a relief for tech companies, it marks the beginning of a new era. The BIPM will now consider introducing a leap hour in the future to address the growing drift between atomic and astronomical time. For now, the focus is on ensuring systems can handle the increasing gap without further disruptions.