The global timekeeping system will no longer use the leap second adjustment mechanism.

On October 15, the 28th General Conference on Weights and Measures in Versailles, France, adopted an important resolution: starting from May 20, 2027, the global timekeeping system will no longer use the leap second adjustment mechanism that has been in place for more than half a century, and the maximum allowable value of |UT1UTC| will be relaxed from the current 0.9 seconds to 3600 seconds, that is, 1 hour. #LeapSecondChangedToLeapHour# It is reported that the most recent leap second occurred at 7:59:59 Beijing time on January 1, 2017. At that time, the clock first went to 7:59:60, and only one second later was it exactly 8:00.