Since the time and date(ZDA) interface of the domestic core switching chip is generally the mobile ZDA standard interface, which is inconsistent with the Beidou standard ZDA interface of the Beidou satellite navigation system, the transmission of Beidou time cannot be realized in the backbone network with the domestic chip as the core processing unit. A conversion scheme between Beidou ZDA interface standard protocol and mobile ZDA interface protocol is designed. By comparing the similarities and differences of the two time-of-day(TOD) data frames between them in detail, the Unix timestamp is used as an intermediate medium to realize the conversion of different time expression between them. The experimental results show that under the built network environment, the ZDA output from Beidou satellite receiver can be stably converted into mobile standard ZDA, and the converted mobile time data can be parsed by domestic chips and transmitted to the core backbone network normally and stably.