UTC replicas representation and support

[gwbres]

Hello @ChristopherRabotin,

I'm thinking of potential future capabilities.
Today Hifitimes offers means to navigate in all supported timescales.
The next version offers means to translate timescale to their actual state (with 1 ns accuracy), or translate timescales with 1 ns accuracy (provided you have access to the state translation information). In my framework, I use RINEX files to to that.

Would you accept introducing a subsidary TimeScale::UTCk(String) enum, that would allow applications to describe UTC replicas?
A UTC replica behaves strictly like UTC(world), so follows leap seconds and must have identical logic.
But we would have means to differentiate between them.
One example, Clock RINEX files describe local master clocks with respect to standard timescales.
For example, that file gave the |UTC(USNO)-GPST| polynomials for that day:

So we can use it to convert a GPST Epoch to UTC(USNO) Epoch.. Eventually, my framework will be smart. If you have another RINEX that gives |GPST-UTC| you can directly convert UTC to UTC(USNO) 🔥

So really, all that is needed, is a new enum entry, possibly printing/parsing logic but that's it.