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Time scales consistently provide precise time stamps and time intervals bycombining atomic frequency standards with a reliable local oscillator. Opticalfrequency standards, however, have not been applied to the generation of timescales, although they provide superb accuracy and stability these days. Here,by steering an oscillator frequency based on the intermittent operation of a$^{87}$Sr optical lattice clock, we realized an "optically steered" time scaleTA(Sr) that was continuously generated for half a year. The resultant timescale was as stable as International Atomic Time (TAI) with its accuracy at the$10^{-16}$ level. We also compared the time scale with TT(BIPM16). TT(BIPM) iscomputed in deferred time each January based on a weighted average of theevaluations of the frequency of TAI using primary and secondary frequencystandards. The variation of the time difference TA(Sr) $-$ TT(BIPM16) was 0.79ns after 5 months, suggesting the compatibility of using optical clocks fortime scale generation. The steady signal also demonstrated the capability toevaluate one-month mean scale intervals of TAI over all six months withcomparable uncertainties to those of primary frequency standards (PFSs).

Months-long real-time generation of a time scale based on an optical clock