Clock control method of an air conditioning system and air conditioning systems

The present invention discloses a method and a clock control air conditioning system for an air conditioning system. Wherein the clock control method of an air conditioning system comprising: clock information received indoor outdoor unit; and an indoor unit updates its own clock information to enable clock information clock information itself is the same as the outdoor unit. With the invention, to solve the problems of the prior art clock air-conditioning system can not be unified outdoor unit and indoor unit, thus achieving the unity of the indoor unit and outdoor unit clock information, the effect of improving performance of the air conditioning system.