Previous discussion of/decision on generic date/time markup?

I dimly recall some discussion in the past of generic markup for dates and
times, but I don't remember the details, other than nobody proposed a
generic date and time markup domain.

Unfortunately, it's not possible to search usefully on keywords like the
"date" and "time" and "markup" so my attempt to search the mail archives was
a failure.

Does anyone have any memory of this discussion?

Thanks,

Eliot
-- 
Eliot Kimber, Owner
Contrext, LLC, http://contrext.com
DITA Solutions for Publishers and those who publish