With the development of the Real-Time Service (RTS) project, the timing users can use the real-time Precise Point Positioning (RT-PPP) technique for time transfer research. As a major participant of the RTS, the Centre National d'Etudes Spatiales (CNES) conducts PPP-WIZARD (Precise Point Positioning with Integer and Zero-difference Ambiguity Resolution Demonstrator) project to assess the real-time PPP with integer ambiguity resolution method, which is also called the RT-IPPP. In this paper, we use the real-time products broadcasted by CNES analysis center to examine the contribution of real-time ambiguity resolution on time transfer. The experimental results show that the standard deviation of the RT-IPPP results are decreased by 28.0% compared with the RT-PPP results. After using the RT-IPPP technique, the maximum error bound of RT-IPPP the time difference is decreased by 30.6%. The experimental results prove that ambiguity resolution can significantly improve the performance of time transfer in the real-time mode.