Abstract: The international time standard "Coordinated Universal Time" is based on the Earth's rotation period as the timing basis, using seconds defined by the oscillation frequency of cesium atoms as the basic unit of time, and achieving time synchronization between "Coordinated Universal Time" and atomic clocks through "leap seconds". Due to the increase in global average temperature, polar ice caps are melting, sea levels are rising, which affects the Earth's rotation and leads to uncertainty in time synchronization. This article briefly introduces the development history of timers, explains the necessity of unifying time standards and achieving time synchronization, and discusses the dynamic principles behind the impact of climate change on time synchronization.