> > A date between 1900 and 1999, not estimated to a year is denoted 1950P2.
Thanks for this clarification! So, 1950P2 and 1920P2 and 19XX mean different things. That seems good!
> I have another suggestion: the posfix "s". [...] When I speak of the 1990s, for example, I mean what you now call 199.. Why not call it that! [...] One could extend it too to other units such as century etc.. It is kind of like a reversed decimal point.. 0s means decade... Can dicuss all the other combinations..
That seems good, too! But, I still wonder what the first decade of the 1900s would be denoted.