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It strikes me as surprising to imply that we don't have time-keeping standards for solar system exploration that take into account relativistic differences.

the CSPICE toolkit from JPL/NAIF has a bunch of routines to calculate local time, local time of arrival of events from other places (light cone, I suppose?), down to the nanosecond.

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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/Ephemeris_time

https://en.wikipedia.org/wiki/Coordinate_time

Etc

That code exists for calculating those things does not mean there are timekeeping standards that support them.

True, should have mentioned (as sibling comment did) that the code _uses_ several timekeeping standards to do those calculations.

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