I was thinking there should be a new tech in the late-transhuman era.
The standard unit of time is not universal, but rather subjective and can only be observed in perspective and the same could be said for the speed of light. Photons can only reach up to 301,000 km/s, however if you were to reach 99.999% speed of light, photons would still be 301,000 km/s faster than you. This means that you are only moving at 99.999% speed of light by perspective. So this means that everything around you is subjectively moving at 99.999% speed of light in the opposite direction. Your unit of seconds is now equivalent to Earth's unit of decades. As light moves directly with time, photons have a temporally, infinitely fast velocity. This outcome, however, is unacceptable to any physicist. There needs to be some unit that is non-dimensional i.e. Planck units. Planck units are constant no matter how much the space-time continuum bends and as such would become widely accepted and practiced for any future technology that tries to test the boundaries of nature starting from something so minor as time dilation.
Subjectively, the Planck unit of time is 5.4 × 10^-44 seconds. Objectively the two are impossible to compare as Planck units are linearly constant across all boundaries of the dimensions whereas seconds bend to fit space.
The tech could be called Planck Algebra and would be required by many time, velocity, energy and mass - oriented technologies.