Agreed; the slashes are not ISO standard, but they are perfectly clear to both humans and machines. (ISO uses slashes to join two date-times or a date-time and a duration into an arbitrary interval.)

On Mon, Mar 11, 2019 at 4:37 PM Arthur A. Gleckler <xxxxxx@speechcode.com> wrote:

On Mon, Mar 11, 2019 at 11:09 AM Lassi Kortela <xxxxxx@lassi.io> wrote:
By the way, would it be possible to change the date format used in the
SRFIs? I'd like to suggest the international standard date format (ISO
8601), i.e. YYYY-MM-DD. It's unambiguous and already in quite wide use
around the net, especially in technical circles. It's also recommended
by IETF as RFC 3339: <https://tools.ietf.org/html/rfc3339>.

I've stuck with the format used by my predecessors, which is ISO but with slashes, and often without leading zeroes. It doesn't cause confusion between Europe and the US, as far as I can tell, and that's the primary benefit of the ISO standard.

Going back through all the old dates to update them would be a lot of work and error prone, for not much benefit over YYYY/MM/DD.