Optical clocks have great potential to generatie high-performance atomic time scales. This paper introduces the basic idea of generating a local time scale steered to NIM-Sr1 optical lattice clock of the National Institute of Metrology (NIM) , and the evaluation of the noise parameters of the HM57 hydrogen maser which is currently used as the flywheel oscillator. When NIM-Sr1 is operated as a reference clock, it runs consecutively with interrupts. A post-processing steering algorithm is designed to match this operation condition with the comparison data between NIM-Sr1 and HM57 in September and October 2022. The post-processing time scale TS(P) steered to NIM-Sr1 has a maximum time deviation of 0. 7 ns compared with TT(BIPM22) within 60 days. Moreover, a system with dedicated hardware and software is built to generate a real-time physical time scale by steering HM57 to NIM-Sr1. The generated real-time physical time scale TS(R) in April 2023 is evaluated with a maximum time deviation of 0. 89 ns compared with UTC within 30 days. Keyword