There definitely are various timescales and standards that take relativity into account https://en.wikipedia.org/wiki/Barycentric_Coordinate_Time https://en.wi

There definitely are various timescales and standards that take relativity into account https://en.wikipedia.org/wiki/Barycentric_Coordinate_Time https://en.wikipedia.org/wiki/Barycentric_Coordinate_Time https://en.wikipedia.org/wiki/Ephemeris_time https://en.wikipedia.org/wiki/Ephemeris_time https://en.wikipedia.org/wiki/Coordinate_time https://en.wikipedia.org/wiki/Coordinate_time Etc