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.