Bear in mind, this kind of French bloodymindedness is why we have "UTC" - because if they couldn't have "temps universel coordonné" (TUC) then we damn-sure weren't going to have "coordinated universal time" (CUT).
For an example of the daft amounts of human life expended on examples of such trivialities, look at the amount of effort spent on arguing if the Concorde airplane should terminate with or without an 'e'.[2]
[1] https://www.space.com/what-is-utc.html
[2] https://www.nationalarchives.gov.uk/cabinet-office-100/the-s...