A new time-scale EPT62 is constructed based on the observations of 62 millisecond pulsars in the Version A of the second data release from the International Pulsar Timing Array (IPTA). Timing noise is analyzed carefully for each pulsar, and then a weighted generalized least square algorithm is performed via Cholesly transformation to extract clock error of the referenced international atomic time-scale (TAI). The EPT62 spans 29 years, and the clock difference EPT62-TAI is shown in the figure. The clock difference between terrestrial time TT(BIPM2015) and TAI is also shown in this figure. EPT62-TAI and TT(BIPM2015)-TAI show generally similar trends except early few data points. Because available observational data are much sparse before MJD 50215, the corresponding EPT62-TAI data points in this period have lager errorbar. The Bureau International des Poids et Mesures (BIPM) published real-time frequency difference data between primary and secondary frequency standards (psfs) and TAI to provide frequency standards that define the SI second for constructing time-scale. The combined smoothing filter is employed to combine the clock difference EPT62-TAI and the frequency difference between frequency standards and TAI. Then pulsar time and atomic frequency standards combined time-scale (CPA) is derived through a combined smoothing filter. The clock difference CPA-TAI is shown by a black curve in the figure. The frequency difference curves of psfs-TAI clock difference before and after combined smoothing is presented. The constructing process of the CPA is described. The property of the CPA is compared in detail with terrestrial time TT(BIPMxxxx). The CPA combines the long term frequency stability of the EPT62 with the accuracy of the atomic frequency standards. In general, the property of the CPA is compatible to that of the TT(BIPMxxxx). The comparison of fractional frequecy stability \boldsymbol\sigma _z curves for EPT62-TAI, CPA-TAI and TT(BIPM2015)-TAI is shown in this study. The CPA can also be used as terrestrial time TT(BIPMxxxx). Terrestrial time TT(BIPMxxxx) becomes available one year later, whereas CPT may be computed and maintained in “real-time” in the future. Finally, a brief discussion and some conclusions are given.