> So, I would suggest that we follow the two-digit ISO 8601 for centuries
I do not agree with that, because of:
- the problem with years 1 - 99 CE, which could be missinterpreted as centuries (or the other way round)
- the lack of unambiguous definition of the concept of century (as lengthly explained on this list a few yeras ago)
Let's use ranges for centuries (and decades) to improve readability and avoid ambiguously defined centuries (and decades), I suggest.