Leading computer security experts have warned that adding a leap second to 2015 could have major implications to the global systems.

The corporate regulator in Australia has warned that adding a new leap second will cause major problem for the stock market and IT companies. Experts said that at 11:59.59pm (GMT) on June 30, a leap second will be added in order to allow Earth's rotational spin to catch up with the atomic clocks. The Australian Securities and Investments Commission (ASIC) has already issued a warning on its website urging financial market stakeholders to review their IT systems and ensure that the issue does not impact their operations.

Dr Suelette Dreyfus, a leading computer security expert said, "The last time a leap second was added was on June 30, 2012 and that did cause some technical problems for popular websites like Reddit and Mozilla and LinkedIn. I understand that Qantas computer systems went down for a period of time partially because of it.So is it going to be the end of the world as we know it? Probably not, but for companies that haven't actually spent some time thinking through what it might mean for their systems, there is a risk that things could go astray."

She also said that the addition will affect companies who haven't prepared for the change yet.