I've been using ISO 8601 format dates for years, and it was only a couple of years ago that I discovered what I was already doing had been standardized by the ISO.
The time format addition in the most recent version of the standard is pretty interesting.
And I've wanted to have the way pipermail generates URLs for articles fixed for years, but I'm not a Python programmer.
Sigh.... Anyway, count me in as a strong supporter of ISO 8601 format dates used consistently throughout all of Python, much less Mailman.