I'm in the US and have had problems with C-level douches misreading dd-mm-yyyy dates in some system we had that logged in that format and freaking out (and also missing that the log time stamps were in UTC-0, causing further confusion/freakout)

Anyway, this is part of why I always use yyyy-mm-dd, because nobody will confuse that date string for any other date, and everyone who can understand dates at all will be able to read it.

your pedantery is apreciated.

At least it makes my folders really easy to sort through...

It's close, sure, but actually no. That standard currently requires the letter T (and no white-space) between date and time when both are present, and, frankly, that's ugly and a space should be allowed.

An old version of the standard allowed the space, and GNU's coreutils seem to have carried on the tradition, so I'm not alone in thinking this.

No because it's the global format that typically uses periods.

D.M.Y (normal)
Y-M-D (superior)
M/D/Y (mental illness)

Mixing up the formats and denominators makes this mess even worse.