Sorry - I wasn't saying accountants "didn't do it" - just that "they shouldn't"
My pedantic (and massively down-voted post I now notice) was just an expression of my annoyance at mixing syntax.
I'd also have accepted "M" as "a million" and therefore MM being 1,000,000,000,000... but they didn't do that either..
> MM would be 2 thousands - as in the representation of the year 2019 as MMXIX (2x1000 + 10 + (10-1))
> Anyway, MM is clearly man-month or 2 digit month of the year when you stringify a date... we don't need more.
Tell that to the entire practice of accountancy.